I don't know if this should go under bugs, or suggestions.
If you press the delete key on a animations panel, can you get a warning prompt?
<img src="http://i.imgur.com/D0qYA.jpg" border="0" />
It happens when I am bouncing between the Animations Panel and the Animations Frames panel. I try to delete one frame in the Frame panel, and accidentally delete the whole animation. And the worst part, you can't undo! So you have to reload all the sprites in again. :(