This is already possible. Provide a general bones animation file for your users. They can import it in all their models. They don't need Pro for that, because weights are not stored in the animation. Weights are stored in the bones. So your weighted animation file will work with all models that have your standard skeleton, and with all engine versions, although it will look better in Pro.

I could implement loading a bones scene into the engine from an animation file or from a master model - but I see no real advantage in that. Bones animation does not consume any noticable RAM amount. The only advantage were that you don't have to import the animation in MED. But you'd probably want to do that anyway for testing the animation in the editor.

That said, I'm nevertheless very interested in supporting external plugins, such as your AI plugin. So if you need some features please continue to request them.