I decided to drop Tokamak and write a physics engine myself... so far I have it about 70% done... it's an RK4 integrator and it models springs as well... it's much faster and of course, I have more control over it so I can tweak it on a per-project basis...

Collision detection is next... I'm still not happy with my camera though... I'm thinking of porting my old camera over... basically it modeled the spring outside of the physics engine.. that's how I cheated.. I don't really need mass.. but springs make movement more smooth...