Indeed...
I have a lot in the works right now. The latest version of what I'm working on is published here:
https://github.com/mpaperno/aq_flight_control/tree/next A full is also available there. There are pre-built firmware version on the AQ ("next" branch is the latest versions, "master" branch is older but does have AH mode -- check the CHANGES doc for details, it does show where "next" diverges from "master").
A lot of this has been around for a while but most has been waiting on an updated QGC to make setup of the new controls scheme easier. This is almost ready, and I should be releasing QGC 1.7 within a day or two (hopefully over the weekend). Just a bit more to do. Pretty much all the changes have been pushed to the already.
I'll make a more formal announcement on the forums when it's all ready to go.
I also have another firmware update coming up which lets you make any (sensible) parameter be adjustable via radio controls while in-flight, which is just great for tuning PIDs and some other things.
Stay tuned...
Cheers,
-Max