hi there, I have the same problem...
my joystick is a Saitek Cyborg 3D Gold, the joystick-test-program shows the throttle as "Slider_0", but when i assign it to "Move Chassis forward/back" or "Set throttle value" in the actionmapper it doesn't work in game, I also have played around with some sensivity values for the throttle but it didn't help either...
Since I would only use it for VTOL and Aerospacebecause I can't handle the mousecontrol there could be another solution...
I managed to map my mouse's X-Axis to turn the aircraft, and manually assigned A and D to roll left/right.
what I can't fix myself however, is the fact that both mouse axis are inverted, the Y-Axis as well as the X-Axis.
for some reason I can't solve that problem, neither by using the actionmapper, nor by changing the actionmap.xml directly...
Any idea how to make mouse and/or joystick work properly?