I don't see what the problem is. GSX uses the standard Simconnect menu, which once opened, reacts to either the mouse or the numeric keys on the main keyboard so, assuming your goal is to control GSX from a joystick instead of a keyboard, if you use any kind of joystick software that allows macro programming, you can assign any button to emit keypress from 1-9 and, it will work with every app ( even the default ATC ), not just with GSX.