also, not totally sure but i would assume that this would lag like heck.
this is what i mean, stuff like this should be in blockland. PHYSICS, stuff like a ball with roll down a hill and that you trip if you hit a rock(major lol) and all kinds of cewl shiz that would make blockland frigan epic!
go to bedroom map, fly into window, find a hill, spawn a vehicle spawn, spawn the ball vehicle. =o!
also, for the tripping on a rock, would be rather irritating, also thats in roblox, it is irritating there.