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.
Currently, the point of origin is in the middle of the layer and expressed in %.
But often, it's necessary to the place point of origin elsewhere.
In character animation for example, when animating an upperarm, you need to place the point of origin at the "shoulder"/upper part of the upperarm; not in the middle. Currently this takes quite a bit of trial and error.
It would be very helpfull if there would be a "dot" indicating where the point of origin is located. And, even better, if you could drag the point of origin-dot to the desired location.
This would help a lot in many realworld animation scenario's.