Add a Magic Wand Tool
I personally put a lot of detail into my animations, so I think it would be a good addition to the select tool to add the magic wand tool so that people would be able to animate shading and gradients easily on characters. People would also be able to delete a large portion of things at a time.
It would be amazing if there was a fairy wand tool or gradient tool but it might make it incompatible if you add the gradient thing so maybe just the fairy wand tool for now?