Ack Ack isn't trolling. He's right. You're basically asking HTC to do thrustmaster's job in supporting their hardware. The game is VERY accomodating for almost anything you could wish for.
There are only so many buttons to go around, and having gear toggle on 1 button instead of gear up on 1 and gear down on 2, is a good thing. I have rocker buttons on my throttle quad, and I map them to different but related things. For example, gear toggle is mapped to the up-press of one rocker switch, and gear brakes is mapped to the down-press of it. Map zoom in and map zoom out are the same. Flaps up and flaps down another.
I think having HTC break up every "toggle" into the separate elements would simply lead to an unfriendly list of commands to scroll through when you're trying to set up your controls. For the most part, only a very small minority would make use of it, as well.
So, overall, outside of your VERY specific issues, it wouldn't help much if at all.