I (last winter) developed a firmware for the 9X transmitter targeted for Helicopters. It shares some primitive/basic code with other firmwares, but most of the code it totally rewritten. I have not worked on this for a long time, but I thought I would post here in case someone wanted to use/look at the code for some reason.
It is available here: http://code.google.com/p/heliclone/
I do not plan to work on this any time soon, but one shall never say never...it might happen.
Anyhow, all hard working guys in the 9X community....keep it going. It is awesome stuff!
Regards
Gruffy