Just a few crazy ideas.

Bank -

A bank that players or guilds can use to store crowns, energy (crystal or mist), or items. There could be interest on crowns and it would be great to store mist energy.

Voice chat -

I know this would take some time (I'm a part-time programmer) but I think a voice-chat feature would be great to converse with your party while in the clockworks. Scenario: your party is in the middle of an arena and you are fighting monsters, but you see something that maybe a party member might not. You can't type what you want to say because you are fighting, but if you talk, then they can hear you and act on it quicker. If you do this, DO NOT ADD IN AN OPTION FOR HAVEN OR TRADE CHANNELS!

In-game message board -

This could be a place in Haven that is similar to the forums here.

Auction House upgrade -

Here's a weird, but cool idea: make it able to sell multiple items per lot. For example, say that I want to make a Defender. Instead of seeing what individual items I could buy or bid on in the Auction House, if this idea were added, I would be able to search for something like "Defender Package" and then there would be an auction that would have everything to make a Defender (Blue Shard, Scrap Metal and Iron Gear) in 1 auction. This could also be done with any combination of items (Wolver Set, All Shards, Rose Regalia Set, or any miscellaneous arrangement).