very, you know, I think another cool thing would be a custom powerup maker, imagine a powerup like a flamethrower, but it would hit 360 degrees around you and knock back opponents, like a burst of flame :D or a tri shot laser!
I really think this game could have added some decent area attacks that don't involve friendly fire (e.g. Nuke). A tank being fired at from behind was essentially helpless for a few seconds, but that made the difference between survival and destruction. A radial Flamethrower would have made for an excellent deterrent for tanks that like to get close.
Hey, I thought of another cool proposed power-up! I figured that since we already have a Turbo that gives tanks a speed boost, there should also be an item that temporarily slows down other tanks. It could be a radial shockwave that affects adjacent enemy tanks, and there could be 5 per power-up just like the Turbo! Alternatively, it could affect everyone on the map except for the user, in which case, there would only be one use per power-up.