Creating a separate animation clip for the fingers is certainly one way to do it.
Probably a better solution would be to create a custom animation clip for animating your character fingers (with controls similar to how a 3D Animation Rig would be for such a task). Unfortunately such a clip does not exist since it may (or may not be) something project/character specific and as such while I could create such a clip for fingers animation, it may not work in all cases. I will give it a try though and see if I can come up with something working at least in most use cases. That is an interesting suggestion 🙂
Gavalakis
