PvE elements are often suggested here. Or at least they were on the old forums, but meh. Typically the response is something along the lines of:
PvE would be really cool, but it has a couple of issues.
~Difficulty required to make an entirely new gamemode and balance it against the current mechanics.
~Difficulty of creating and maintaning AI behavior.
~(This one is my personal favorite) PvE doesn't really fit with the type of game warmerise is. It's like adding PvE into counter strike. You could do it, and it might even work, but it wouldn't really fit the game, imo.
