Please correct me if I am wrong on any of the points.
An option to loop back the animation to a specific frame.
An option to add new frames in the animation from within the animation window.
The animation editor seems to crash very often, especially when using the select tools. They don't seem to snap to the pixels of the image before you let go of the mouse and make a selection. I remember this happening in mmf 1.5 back in the days, which were a sure sign that it would soon crash. May be a related kind of problem.
When you have selected a part of a sprite with a select tool it would be nice to be able to manually rotate it. When I used the rotate tool on top strange and unusual things happened, could not undo.
The paste clone seems to only work as paste, which makes creating parts for platform games tedious.
Other than that it seems like a fantastic product. All respect to the creator of it. Now it only needs some kick ass games to be made with it