I'm wondering if it would be possible to run multiple Physics instances? At the moment, EE just has the one Physics instance, which is a bit restrictive. I would like to be able to create a second PhysicsClass instance to run a secondary physics simulation. To do this, you would need to be able to specify an optional PhysicsClass reference when creating an Actor so it is added to the specified physics simulation, instead of the default Physics instance. Is this possible?

I recommend getting the source you could easily do most of the things you're requesting on your own I'm currently busy working on other things.