There's a program called Mac2Joy or similar, which makes it possible
to map keys to your joypad for ShapeShifter...
In theory it should work on cd32, but I fail to get it running some time ago.
The additional problem is, that even if it works, it won't work with
whdload-games as these (or better say the games) take over the OS,
and the program isn't recognized any more...