Hey, just thought I'd stop by the forums and give some of my thoughts.
These may or may not be underway, but they're simple, yet could work nicely.
Stats. Maybe in the "progress" tab or another tab when signing up for a game, it'd be interesting to see your personal stats. Total matches, kills, deaths, teamkills, best score etc.
Extra powerups. Nothing too spectacular, but maybe something like bomb timer up or bomb timer down, so you can be more careful or choosy with these powerups to what would suit you best. Slow and powerful, or quick and small.
Training games. An extra type of game mode, which uses no fee and gives no rewards, but works like a regular lobby like in the gates. So you can have it open, or make it private and invite your friends for a private match.
And that concludes all of my thoughts for now. Oh, and you must excuse me if these have been already suggested; I don't use the forums as often as I should.
Thanks for reading.
I like the stats idea. For the powerups maybe they could add ? powerups and skull. The training one should allow you to go against NPC players or against you friends.
I don't understand in Spiral Knights, you can't choose your team or anything, it just says random team.