very cool, i need to implement the physics engine into my castlevania game with something almost just like what you made for platforms and a few other things, but its a bit confusing to program, im eager to see ur finished product
There's an example of swinging rope platforms included with the extension (in MMF2\Examples\Phizix-Chipmunk Engine\Platform Movement.mfa) that might be helpful. It doesn't seem like it'll play nicely with platform engines that aren't custom-made for it, though, and there does not currently seem to be an easy way to tie a body's collision detection to an active object's animations. Your engine looks pretty tight, so if you do decide to play around with it, make sure to keep a copy of what you have now.
"Omg. Where did they get the idea to not use army guys? Are they taking drugs?" --Tim Schafer on originality in videogames