Hello! I play recon in LD, so why not make a guide?
Step 1 - Loadout
I use a loadout somewhat similar to a strikers (because I'm a swrodie), I go with skolver/vog along with GF and Polaris. If you have a third slot I suggest you have a haze-type bomb or an alchemer.
Step 2 - Technique
There are many advantages to being a recon, you're invisible, you can deathmark people, did I mention you're invisible? Yeah, don't let invisibility go to your head. Your invisibility (like all classes abilities) are timed. The cloak lasts about 10 seconds, but it can take hits so you can stay invisible while in the fray. Now, we get to the fun part of recon - Deathmarking. Deathmarking is basically running circles around your enemies until they have a skull above their heads. This takes away all of their armor resistances, so you will be able to do some serious damage. This takes some time, you have to be around your target for around 4 seconds (on my pc that is) to get a deathmark. Deathmarking is extremely useful when going on the offensive or supporting. You also have to be very dodgy to keep cloaked. Your cloak will break after 3 hits, so be careful when charging at a skolver whos spamming polaris at you. Once you hit your opponent with your sword while deathmarked, DO NOT USE A COMBO!! This is very important, unless you are a complete boss or fighting a total noob, don't go for the combo. Instead, follow up with your polaris to get some elbow room, then rinse and repeat.
When supporting, use your cloak to get to the side that your opponents are on, then start firing the polaris, it will help your team because it distracts, does damage, and shocks (unless you use supernova).
If you are out of cloaking, and you're being chased, use your polaris to get some distance, then use your dash to get out of range.
Step 3 - Controls
This should have been No. 1, but oh well. I use custom controls, so no standard movement here. I use my mouse for aiming RMB to fire, LMB to shield, WSAD to move, V to dash, C to shield bash (no use in LD), and scroll wheel for switching weapons. This is a very effective scheme for a righty, if you're a lefty, just switch the LMB and RMB around.
I'm not that experienced in LD, but I hoped this guide helped. Please leave your thoughts and opinions in the comments below.
T2 LD extraordinaire here! (Maybe...)
I would recommend AGAINST using Pulsar guns, because they require distance and if you are a sword user, distance is a premium! I generally use Antigua and Shadowtech when it comes to guns, and they work very well at dealing killing blows and chasing.
If you like to go Recon, bombs are an excellent choice. If you fully level up your bombs, you get a huge CTR max, and you don't even need UVs or demo! I've found that generally I don't have too much staying power, so Blast Bombs, Haze Bombs (any version), or Seerus Bombs are all effective and controlling a point. Get creative! There are a lot of options with bombs, especially if you mix them with other weapons.
Swords work very well, but the ASD (Attack Speed Decrease) is hindering. No, not game breaking, but hindering. If you can counter this somehow, do so. I love the Arc Razor, because of it's long range and long-distance combo. The damage is usually poor, but a Death Mark to the head will fix that. :P The Arc Razor is also handy because of it's quick speed, allowing you to mostly counter the ASD as well as hide shortly after attacking. Other viable swords are Flourishes (I like the Flamberge), SS lines, Troikas, and Brandishes. Keep in mind that your CTR med goes to all weapons, so you can use Brandish and Troika charges sorta quickly.
In general, I play sneakily, going to the opponent's closest point first thing in the game to hopefully shut it down after the main mob leaves it. If you have all the points, you could either patrol the points or guard one or two.
As for controls, I use Dreathruxy's controls but I also use MMB (Middle Mouse Button) for dashing. It's handier that way. (On an unrelated note, I use LSHIFT+LMB for Shield Bash.)