-dumb-
I imagine rewriting vehicle physics would fall to kompressor. Between the brick physics and lighting, low level stuff like that seems more his domain.
Did badspot fix it so that when you build in F8 mode you can change the direction you're looking and your brick movement will adjust to that direction? I was building a while ago and I could do that when I remember it not doing that before.
There was a NARG mod for that. Maybe you installed it.
Badspot told people on his server what has to be rewritten. It's somewhat complex sounding.
So basically, the connection can handle physics right now, but the actual code to do the physics right still needs to be figured out efficiently for the engine?