The left throttle is the Z axis and the right throttle is the slider.
I have tried to assign the slider (right throttle) to other things like flaps and stuff but FS9 does not recognize the slider but only the z axis.
In other words, the slider is totally useless in FS9 unless a tweak is set in somewhere which I do not know if such thing even exists.
You can use the seperate throttles in FSX though.
