Ability to run your own RP.
Or make a more 'game-like' game (with stats and such) where you can spend points in the beginning to give your character an edge. +1 Str, +20 gold, etc.
Maybe the ability to play a 'special' character in one of the more realistic RPs? (royalty, magic-user, non-human?)
And some way to trade points back and forth.
..that's all I got.
All this stuff would have to be way down the line when we have a much bigger user base of course.