MD82 reverse thrust

OK I admit to being a FS inards word not allowed.  But all I want to do is program reverse thrust for the Maddog using a Thrustmaster Hots throttle.  The AAO documentation does not address this as far as I can see.  Just stock Thrusmaster gives a reverse thrust bot but not where I want it.  The Thrustmaster has a detenf where one must pull up and then reverse thrust is activated using the throttle motion allowed beyond the detent. Any help would be greatly appreciated.