Meh, I'm just making the game engine, Peter's physics engine is his own(and is the trademark of AR), so I suggest he'll add his own code.
Armadillo Run belongs to Peter Stock, and so is the physics engine, if the development on the game port continues his name will be practically everywhere
If he wants he can just port his engine to the AR4PPC framework.
Peter, may I continue developing AR4PPC? (everything can be under your supervision. After all, the original program belongs to you)