Had this running around in my head a while, here it is:
So you know all those really cool vehicles people have made out of walls and backgrounds and stuff in the ALE? My suggestion is a trigger or interface or just something that lets you take a group of walls, doors, backgrounds, or whatever the "vehicle" is made up of and apply vehicle physics to it. There would have to be a wheel or something that you could put onto vehicles and perhaps some other vehicle parts, like a gun mount. There would be an option for different physics, such as land based, water based, or air based.
Course, there's no way this could ever work in PB2.
Thoughts (I know its a little bit rough of an idea but still)?