I was worried about this working for me as I have an older laptop, but I am loving this so far. I managed to animate a layered skirt and just finished with Armaseda hair (lots of curls). I have to learn to be patient and wait for each step to finish as I have some lag with my system, but if I do things in the correct order it works. As is you will have problems with people hitting buttons too soon or in the wrong order -- are you planning some kind of error catching? Some of us idiots can break anything. :)

I see PAN is in your todo list. How about rotate, or is that too difficult? I like the idea of a lasso for selection too.