Thanks a lot John!
Customized grids including some perspective functionality is something we want to include. But it will be after the alpha stage where a lot of functionality is prioritised higher. It is a good idea, and I think we could do it in a natural way so it won’t clutter up the simplicity of Animation Paper.
Rotation tool in steps: If you use shortcuts < and > it will rotate in steps of 15°. You can always reset your view (no rotation and 100% zoom) by hitting 0. Other shortcuts to know about is the numpad number keys: You can use them as compass directions, so 8 is north (no rotation), 9 is rotated towards north east, 6 is east, and so on.
Yes custom layer colors are coming very soon. Alpha 4 or 5.
Custom brushes are not possible at the moment. We plan to do a brush system for the next major release (v6.0).
Thanks for taking the trouble of updating your system for Animation Paper. I hope you think it is worth it.