Overiding Prince of Persia 3 gamepad restrictions

I installed the game on my PC, game runs fine, and I can configure it without a hitch except for one little thing. When I played POP 2 I got used to using the trigger buttons on my 360 controller for block and slow time/rewind. But when I try to set them to trigger in POP 3 it ignores the command with no prompt forcing me to either select another gamepad key or canceling the key change.

Is there any problem, or way to decrypt the key configs and force the change in whatever file it writes to? I really want to use my trigger buttons for block and sand powers and not the shoulder buttons. I tried to circumvent it with Joy2Key but it looks like it doesn't work both ways. *Sigh*