Thanks a lot for your nice words and for teaching using Animation Paper! That’s great. Here’s my answers…
1) Your point is noted. I do follow you. My hesitation is that if I add just a few more tracks, people will ask why the limit? The challenge is to keep AP simple – yet have all the features important to the pro animator. But the more tracks, the more we need other audio functionality as well. But maybe it can be done, keeping everything clean and simple. So I will definitely think more about it! Thank you for letting me know about what you need as a teacher. Appreciated.
2) Yes, as you found out – you can name the layers. 😉
3) Yes, you can use “annotations” to number your frames (as well as write notes to plan your animation, write phonemes or draw mouth shapes or timing charts). Just remember to link your drawings column to the annotations column, so you keep your numbers locked to your drawings.
4) Yes! We have been planning the iPad version all along. It will be done fairly shortly after the final release of the desktop version.