You guys are all more than welcome to post ideas for both the current game, and the upcoming totally remade "version 3" of the game. However, please keep in mind that development efforts have pretty much moved entirely towards the development of V3. So the likelihood of me doing any updates on the currently playable game (V2) based on your suggestions is highly unlikely.
Original guideline post updated on 10/29/13 (reworded to further emphasize the extent to which development has shifted towards V3 instead of V2).