NO MORE PTT, BUTTON REMAPPED :) o
CONFIRMED, this is how to keep that annoying PTT message from coming up on American Touch Pro's (Fuze maybe? whatever).
Keep in mind, you can't individually map this button with this method, that may come later.
Step 1: Registry editor, remove HKLM/Services/PTT
Step 2: Create a key in HKLM/Software/Microsoft/Shell/Keys called "40C2"
Step 3: Create a string within that key, titled Name with the value being "Button 6" or whatever
Step 4: Soft reset.
From this point on you can remove 40C2, but your PTT button will simply perform with a press what your send button performs with a hold (which can be remapped easily... Settings/Buttons/Button1(Hold)).
NOTE: This apparently doesn't work on all Fuzes, trying to work that out now. It worked with my pre-release, but I'll update this post if a better way is found. Apparently on at least 1 Fuze it only DISABLES the PTT button.