Elfie and others wanting to use clutch button:
you have gone to your icon in the taskbar, right clicked it, chose "control panel", then "mfd", then unchecked "enable clutch mode" right? Otherwise your clutch button would negate any other joystick command being sent to the game.
as for Dusty:
have you tried going into aces high options, under map controllers, then pick your throttle axis, click "advanced", then click "invert axis". Might do what I think you want it to do.