Something I've been thinking about Flash's untimely death...

I think some of your questions are answered in this MAX presentation aimed specifically at banner ad creators, because who else was still using Flash up until the Chrome pause of non essential Flash content beginning in September. I started playing with authoring an AS3 doc, breaking apart text, and then converting to Canvas, and applying all tweening in Canvas. I was surprised that even a motion preset worked, given that you are supposed to use classic not motion tweens.