Hello JayPee,
assuming that the joystick is your only game controller and that it has 32 buttons and a single POV-hat, you could replace the existing joystick mappings with the following lines to unbind the buttons:
SimDoNothing 0 -1 -2 0 0 0
SimDoNothing 1 -1 -2 0 0 0
SimDoNothing 2 -1 -2 0 0 0
SimDoNothing 3 -1 -2 0 0 0
SimDoNothing 4 -1 -2 0 0 0
SimDoNothing 5 -1 -2 0 0 0
SimDoNothing 6 -1 -2 0 0 0
SimDoNothing 7 -1 -2 0 0 0
SimDoNothing 8 -1 -2 0 0 0
SimDoNothing 9 -1 -2 0 0 0
SimDoNothing 10 -1 -2 0 0 0
SimDoNothing 11 -1 -2 0 0 0
SimDoNothing 12 -1 -2 0 0 0
SimDoNothing 13 -1 -2 0 0 0
SimDoNothing 14 -1 -2 0 0 0
SimDoNothing 15 -1 -2 0 0 0
SimDoNothing 16 -1 -2 0 0 0
SimDoNothing 17 -1 -2 0 0 0
SimDoNothing 18 -1 -2 0 0 0
SimDoNothing 19 -1 -2 0 0 0
SimDoNothing 20 -1 -2 0 0 0
SimDoNothing 21 -1 -2 0 0 0
SimDoNothing 22 -1 -2 0 0 0
SimDoNothing 23 -1 -2 0 0 0
SimDoNothing 24 -1 -2 0 0 0
SimDoNothing 25 -1 -2 0 0 0
SimDoNothing 26 -1 -2 0 0 0
SimDoNothing 27 -1 -2 0 0 0
SimDoNothing 28 -1 -2 0 0 0
SimDoNothing 29 -1 -2 0 0 0
SimDoNothing 30 -1 -2 0 0 0
SimDoNothing 31 -1 -2 0 0 0
and add eight more to unbind the hat as well:
SimDoNothing 0 -1 -3 0 0 0
SimDoNothing 0 -1 -3 1 0 0
SimDoNothing 0 -1 -3 2 0 0
SimDoNothing 0 -1 -3 3 0 0
SimDoNothing 0 -1 -3 4 0 0
SimDoNothing 0 -1 -3 5 0 0
SimDoNothing 0 -1 -3 6 0 0
SimDoNothing 0 -1 -3 7 0 0
Respectfully,
Thingol