The creator is very powerful. Congrats for that.
I've found out, animation were quite often rotations of anything, a dial, a hand, a bar, a shape, around its own center or around another center. It gets tricky, when you decide to limit that rotation, start it from a certain angle, specially if the object doesn't rotate around its own center. So I'd suggest a rotation wizard as such:
I'd suggest, the equation of the rotation should be displayed as the user customises ssettings in the wizard, as a teaching method.
It would also be nice to then be able to manipulate the rotation variable as a tag (in the transparency setting for instance).
I also would love to get a slicing option on shapes. It would allow an easier creation of rounded gauge.