Awesome tool! In the animation player when i click to change the FPS, i cant see the other options unless i hover over them. Also could probably benefit from some fort of documentation, tooltips, or other UI elements to help people figure out what they are doing. Maybe a copy to next frame something like that, it took me a few minutes to understand i had to copy the whole frame, paste into the next frame, and then make my edits to it.
All in all, awesome little tool!
Update: it is all drop down lists that have properties invisible until hovering over each option. It's as if the text color for the list item and the list background is the same, and then when i hover on the list item, the text color changes.
Great work though!