No idea if this is possible.
I always thought it would be good if you made it so if a part of the body becomes disconnected from the head, you lose control of it (maybe auto fracture the joints?). This would mean that if and arm or a leg came off, you wouldn't be able to make it jump around and attack stuff. And if your head comes off, you are finished, because you can't control anything anymore. Would be good for mods like sambo.