Xara Xtreme Flash

[Availor]

Give us a button to reverse the order then we'll all be happy.
Reversing the order of around, say, up to twenty frames is okay, but when you have a hundred of 'em 'tis a royal pain.

How about left to right frames set? Sounds much more obvious not only because it's the way it's used in most of the animation programs but also because it's easier to scroll left and right instead of up and down in case you have too many frames. This way you can create several layers with different animation on each (i.e. top layer has one set of frames and layer 2 has second set of frames).