Recently purchased Logitech G29 Steering Wheel and it seems to be a decent enough piece of Kit.

I've searched through nearly every article on the G29 Steering wheel but cannot find the answer I'm looking for.
Does anyone know what is the highest joystick button on the G29 that is supported by Supermodel? I'm trying to remap player 1/2 "Start" button to button 24 e.g. JOY1_BUTTON24 with no luck in the Supermodel, Also tried assigning Button 24 keys 1 + 2 in the Logitech software with no luck either...
Default setting is:
P1 Start = Key_1, JOY1_BUTTON9
P2 Start = Key_2, JOY2_BUTTON9
Any info would be appreciated.
thanks again,
MJ