I'd like to see them useable for a couple of things.
First, barricades! I would love to see wrecks useable to barricade an exit against vehicles. If a wreck is in a room with a vehicle capable of towing, an operator with the proper skills could barricade or un-barricade a direction to prevent vehicle traffic from moving that way.
The second is as cover. This would allow people to hide in or behind a wreck to offer protection from being attacked, and may lead to some benny-hill style shenanigans as people take cover until their opponent reloads.