Assuming devs don't even want to see any more ideas now, because its enough just getting ready for S3, here is an idea that can be ignored for now, for later consideration.
Faction-Specific Quests
Anyone in this community can make maps and write dialogue files. If they're good enough, devs can add them to game. So why not add a faction name check? This way, a faction's members could make content that becomes part of their own faction-specific questline, that you can only ever see if you get invited to that faction.
Add ability for a faction leader to get an NPC Quest-Giver to move to a faction base (just stand there) and serve faction-specific quests via dialogue to Recruits.
If then it's just a matter of factions building their own maps/dialogue (has to be good quality, and stand the test of lore), then we'd have a new element of competition: which factions have the coolest quests?
(Get quest story approved by devs first before you do all the work, because they are picky about lore/canon.)