Some Ideas?
These are just some ideas that run through my head about SK a lot. They are somewhat simple in fact a lot are. I'm just going to put this in a listing type of form. So lets get started with some ideas.
1. Add some new achievements?
1a, Why don't we have any GOOD achievements? Do T1-T3 no die seems the hardest. Even then its not that hard is it?
1b, Why don't we just add something STUPID that has ZERO MEANING to the actual game but is stupid enough to be worthy as an achievement. Like just one stupid thing I've always thought was funny but super time consuming was remove all the fire in FireStorm Citadel. The second part that is. Like why not! It's stupid but it's funny! It's something TO DO! (Side Note) I did this myself. It gave the game a really weird but cool feeling.
2. Something just new. We have the 3 basics of EVERY game. Sword. Gun. Bomb. Whoo.
2a, Why not add something different a shuriken? Why not! A scythe? Sure! I know the config is stupid and the code would probably make this one null and stupid but like i said at first these are stupid.
3. Some new SECRETS!!!!!
3a, Did anyone know on 1 level in SK there is 3 stones that if you hit 1 it gives a key? WOW! That is the only secret of SK. Wow.
3b, Why not add something stupid like that?! That no one expects to be EASY! Don't say you added it just add it and someone finds it and it spreads like a wildfire that its there!
4. Lets talk the AH, Mail, Such.
4a, Cobalt. Gold. It is SO UNDESIGNED!! I seen spiral knights so long ago with this great design it stood out so much! Then after so long the design became so basic. The AH is just a blob basically. Why not give players a chance to say "Hey! We want to add such and such to the AH back round!"
4b, Mail. I personally don't get alot of mail. But can we get like a color slider to customize our mail? Like why not? It wouldn't hurt anyone (I think at least.) It'd be cool to!
5. Valestone. Moonstone. All thats needed to be said.
5a, We had a way to get money OFF OUR MINERALS! Sprites took that away :(!!!! These 2 ores are ENTIRELY USELESS!! Re-add that to just get rid of these? Give the new players a way to get money easier? Adding 2 new sprites would be just more work. Just re-add the mineral depository. Give us some money :)?
6. CE. I personally have NO IDEA how to buy specific CE. Like I want 50CE to get some orbs for something dumb. NO YOU PAY 10K FOR THIS 100CE. But I only need 50.. then I have 50 leftover..
6a, Can we add another section just for 50ce.. Sure theres the market. But who uses that. Players who set the prices of CE are the ones who control SK. Lets set up a new selection for them? 50ce? 5kcr? :)?
7. What is this accessory remove price.. o-o.
7a, This isn't even a suggestion just WHAT ARE THESE PRICES?! THAT TO GET MY MUSTACHE BACK?!
Thank you anyone who reads this. Takes the time to try and get it more known if you are interested in ANY of these ideas. If you are please share this node in the forums or in-game. Let's keep SK alive longer together :)!
8. Can we name our stuff.. For a price of course.
8a, No this is not like CSGO's nametag system. I'm being literal though. ATON of games let us change our item names and such. Why not SK? I don't know about you but the whole Chaos Cloak. Whoo.. thats so interesting.. Why can't I name it Cloak of shadows? WHY NOT!?
the point of this was to get more attention to the dev's if you like it then please get this forum post more known in the in-game servers.

This would fit a bit better in Suggestions section. Also I have some ideas for weaponry changes I can list myself.
Edit: Would like to give feedback on the current set of suggestions
1. The achievement system is fine as is. Could spend more time developing something else to add in the game rather than some arbitrary goal to get a little icon in your profile.
2. So you mean add a 4th weapon type? Honestly they could rename Swords to something like Blades just to fit a broader spectrum of weaponry for that weapon type. And all they need to do is be creative if they want to add more varying weaponry with the current three types. Adding a fourth may make complications.
3. Some extra secrets would be interesting to spice it up. There's already a couple in the game as is, but personally for me I'm more interested in seeing Scenario Rooms have a higher chance of being generated onto maps, they seem too rare these days aside from the Hubert one.
4. Auction House redesign? Maybe somewhere down the line, might be better to redesign Haven entirely like this at some point rather than just one location. The mail color slider option seems rather pointless, mail is fine as-is, aside from the fee that's just slapped on there, sending regular old messages should just be free.
5. I'm personally for more pets, kinda wish they cleaned up the first three pets first before they move onto others (I'm looking at you, Drakon).
6. Yes you need to buy specific CE amounts from players. Also the CE prices are also controlled by the player market, so assuming by the logic that 50E is half of the price of 100E, that will increase whenever the price of 100E increases. Also for a person that's been on SK for many years, 10k is just ridiculous for 100E, seriously.
7. Personally I also find the accessory removal and the prices for accessory retrieval to be absurd, but at least it's doing one effective job, avoiding the player market from being even more flooded with accessories than it already is.
8. The problem being able to personally name gear is there's always that one crowd of individuals that would name something inappropriate directly, that or sneak in some vulgar innuendos (one example of equipment that already gets some dirty jokes is the Divine Avenger). While it would be interesting to be able to rename gear, not everyone will be using this responsibly.

3, Since not many players do it, many don't know that there are 'hidden' vitapods on the three Ritual Road maps.
There are areas in compounds where a button is under destructable blocks, surrended by drones, pressing the button will spawn boxes, crowns or mines in the corners.
Gremlin scorchers sometimes can be seen in the background, not everyone knows this.
5, Green and blu minerals are not entirely useless, they can be used occasionally for the prestige mission...
Well what I mean are who does the prestige missions once they are max prestige? Those who are like Knight Elite and lower don't even have prestige yet do they? Like really they can USE that extra like 50cr, To get some upgrades & To Midnight, I will post on you're ideas in a second. I am currently in a Vanaduke run, Lol

Well what I mean are who does the prestige missions once they are max prestige?
Lots of players have much more than 45,000 prestige. For example, lots of players have more than 300,000 prestige.
So I know that they do. But I'm specifically saying for the smaller players. They don't get much money running Jelly King. 3k on elite. That's if their lucky to even get a party with people. At least some of us vanguards go into the JK runs with the knights and stuff. But when most people do the Knights are like. What's a Vanguard doing here? THAT SHOULD NOT BE OUR IMAGE! WE ARE THE TOP OF THE RANKING!! WHY DO THEY THINK WE ONLY HELP OURSELVES?! That should seriously change. That isn't a dev thing. That is just a thing us as players need to fix. We are not helping new players. "Can I borrow 4kCR?" To a Vanguard with 6kE for an accessory. It's 4kCR. At least say, Sure I can help you in some levels. They might be lazy. But if people actually HELP them with that situation then the new players won't be like oh well **** that just give me money. We need to help our community. The devs don't do anything because honestly. Why should they? We're a broken community. Our marketing is okay yeah but our community is like. Wow is this really SK?
Sorry if I came off aggressive in that.

I see now that you are thoughtful, Valenlisima.
I sometimes do RJP for the fun of it. And I try to be polite to the newbies. I let them kill the monsters, if they want to. If they ask for advice, then I give it. If they don't ask for advice, then I don't give it. This is all just basic kindness.
They should not ask to borrow 4,000 crowns from me, whether or not I'm wearing an accessory. They're not entitled to my crowns. If they do ask, and I refuse, then they should not be upset. If I lent crowns to every knight who asked, then I wouldn't have any money. So that expectation is unreasonable.
Sorry it took me so long to reply to you :).
1, So I meant that the current achievements are literally minuscule and not even useful nor hard to do. I mean like why don't we have some kind of hardness to it?
2, It shouldn't make complications.. I'm saying like special items like an event item. Shurikens for example? Lets say its Chinese new year or some Japanese holiday. Then we get to open boxes or buy some things y'know? You get like 5 per buy or some BS, You get that one special rarity and have a certain amount of uses, Like 5 uses. 1 Level = 1 Usage.
4, The AH re-design needs to happen not in the future. It is more of a thing that is like well why can't they now? It is just stupid that they don't. Like it is a huge thing and why be like well 500 people play right now. (As of my checking..) That is pathetic.. Update something like the AH would at least spike the players?
5, The CE prices are just stupid theres no way around that. Reset the prices? Who cares THE PLAYERS set that!
6, The rename thing is like well why not? We have a censor in-game anyway. Why not just force that on players in re-naming items. We already force ATON of stupid things we don't like on each other :D!
(I skipped a few and miscounted a few times sorry. Lol.)

@Valenlisima I was actually going to be posting my own suggestions in this thread, I was giving feedback to the ideas you provided in the top post. Just a warning, most of my suggestions will be equipment-based.

So in terms of equipment, here's a few ideas I have for starters (some may have been suggested before):
1. Change the charges (via Catalyzer's normal shots) to detonate upon the monster's death.
I have a thread on this currently in the Suggestions section, it's this one: http://forums.spiralknights.com/en/node/114002
2. Change the Wild Hunting Blade's damage to primarily do Piercing Damage, significantly reduce the amount of normal damage the weapon does.
Weapon has a great damage bonus against beasts, and we really could use another sword that can deal piercing that isn't a rapier.
3. Have Shard Bombs give off a very small haze effect to their released bombs.
I think one way to make shard bombs a bit better is to make them more viable in terms of dealing status effects. Sure it won't ever be as good as a Haze Bomb (in terms of inflicting statuses), but I think the trade off of just doing straight up damage (with a high chance of inflicting statuses on a regular basis to crowds) makes it a bit more worth the while. Plus I was hoping the Crystal Bomb weapon line were to get Poison and some sort of damage boost, say Undead Very High (to go in line with the Salt Bomb and the Sun Shards).

If I get into this conversation
'can you help me please?'
'sure, what is it?'
'give me 3000 crowns please'
then i will offer to do a quick jelly run that will take only a few minutes or a FSC. But very often they decline because they just want the Money without doing anything. But many will do a run, then maybe some other, we Chat and in the end we got eachother one more in the friend list.
But just giving Money away bites my Moral :x
Edit:
There are muuuuch more secrets than only that 3 blocks - Keep your eyes open *coughFSCbuttoncough* (just to cough one very known of many others)
i read the very last part and i wasnt even planning to reply and i read fsc button and im like WHY WOULD YOU DO THAT XD?! THAT IS LIKE JUST COMMON KNOWLEDGE TO MOST THESE DAYS XD!
(for those who dont know. the level before vana theres a button under a box press the button run through the level and get to the last part and goto the left side SEE THE BLUE BLOCK?1 HIT IT!)

does anyone know if it would be difficult to implement new weapon types? I had some thoughts about a couple, and yeah i was also thinking why not just rename some guns to say pistol, machgun, rifle etc.
we basically need 4 things:
1)tradable items on steam market (devs take a % for each item sold)
2)hostable servers, so people can host arcade / pvp with friends. Unofficial server can be modded BUT cannot give crowns. Official server instead can give crowns, but cannot be modded and must use some anticheat (?) software
3)sdk to develop new items / skins. Steamworkshop is also an option. Then devs choose some items and the original creator get some ce / money percentage on sold items.
4)obviously new story content

does anyone know if it would be difficult to implement new weapon types?
Ask yourself if what you want done is just a style change or is a mechanic change. Is it short range high damage? Sword. Is it long range with less damage? Gun. Does it affect an area with damage, status, or crowd control? Bomb.
We have hammers which are melee weapons, but not technically a sword. We have a fist that can shoot projectiles. In the past we had a bomb that shot projectiles...
Really these are just weapon classifications. If you want a stylistic change for the same weapon then I see no reason to change it.
I can however see a change to bombs to make them have a standard attack happening, and then creating a "charge only" weapon type. This could move a few bombs over to that section and open up several new weapons, such as a rocket launcher, a laser sniper, energy (spell) casting, etc.

I had a few ideas, breaking weapon classifications down into melee, ranged, technical
Melee-I had wanted to suggest spears and daggers be added to this, spears using mid range and sweeping attacks for melee crowd control. daggers for real close range, longer, quicker hitting combos, low base damage but a chance to crit(and/or higher chance to crit if thats already in the game, havent seen my sword crit yet though...) and swords as they are maybe getting a slight hitbox extension so that daggers arent just faster swords?
Ranged-for the moment i had only thought just reclassifying the various guns, i need to thing more about this.
Maybe make rifles have higher damage and range , slower rate of fire, and a chance to crit(lower b/c it's ranged.)
Technical-Bombs would get put here, as well as placeable low hp ranged turrets, and placeable refractors that would make shots that hit them split(like to be used mostly with guns, i cant think of how bombs would work off of them.)
I had also thought about maybe changing shields into a weapon type so that players coould carry 3 weapons, just take more damage when not blocking with a shield, you mentioned there are fist/glove/gauntlet weapons in this game?
Yes.
We all want Sega Networks to have someone make new content for us.