Remap Scroll Wheel?

[Sandman5e]

Hi, I just got my axim and I'm wondering if there is a way to remap the button function on the scroll wheel. (Not when I move it up and down, just when I push it in.) What I have is a barcode scanner in the SD slot on top and it would be much easier if I could just push in the scroll wheel to activate the scanner instead of using one of the quick access buttons on the bottom.

Thanks for your help!

[Pebu]

I believe that the scroll button is mapped the same as the center button. I believe it'd be button 3. Maybe button 5, i'm not totally sure.

[Sandman5e]

Ok, that makes sense that they are mapped together, however when I go to the button settings, I can only change buttons 1-6 which are the buttons all along the bottom, including the buttons on the side (record and wireless enable/disable). Does anyone know how to remap the center button?