Congratulations on Sencha Animator. I love it; it's really well thought out and implemented.
Features that would make it much more usable in real world scenario's:
1) audio (preferably with options autoplay on/off, loop on/of)
2) visual feedback on point of origin. (crosshair or something on the object on the stage where the p.o.o. is). Now it's virtually impossible to place the p.o.o. correctly when it's not on the edges of the object. This makes Sencha animator much less useful in for example character animation.
But, again: love the tool!