I don't see anything beyond 117 in APDL. We have so much we want to do and I'm not sure adding support for other regs is best use of the time when this app is clearly targeted for airline scheduled ops. Where we can probably better suit you is the next major update to Logbook Pro. Don't ask for dates, I won't answer that question but it's in the works and that's as far as I'll go. As you're one of our top APDL testers rest assured I'll reach out to you when ready for private eyes on.
Don't use 91, you won't get any alerts at all. At least with 117 it'll let you know that the fatigue you're feeling is recognized in other parts of the industry. It's fun seeing how many red alerts I can get in a one week trip!
As for 121, my personal feeling is that it wouldn't be that hard to incorporate into the app. Basically if you set 121 then it should just ignore all the rest and constitutive night alerts. It doesn't seem like it would be too hard to incorporate 24 hrs rest in 7 duty days as well as 8 hour flying limits (with support for intl ops).