Would like to see this feature too. Though understand that the joystick is analog and not discrete. Maybe a future option for part swapping/twiddler versions:
1) Swap joystick for 5 button (up,down,left,right,push-center) stick replacement
2) Swap joystick for trackball or touchpad (I would love this)
I haven't been able to acclimate to the joystick at all and still don't use it even after a year of use.