Small nifty things..

If you create a sprite in 0.x, but then change your mind when you're in the picture editor there's no way to cancel it. If you close the editor without drawing anything a blank sprite is created.

Of course you should be able to create a blank sprite as well, but when closing the picture editor with no pixels drawn you should get a warning and an alternative to delete the sprite.

Would be nice to be able to use CTRL+C and CTRL+V on the animation tab. Also I think it would be better if the "add frame" didn't also opened the image editor so I can easily create many new frames in a row, and edit them later, or at least, open it on the newly created frame (instead of always showing the first frame)