What do you have your joystick mapped to? If you have the keywiz it should be mapped to keyboard up, down, left and right. If so, you don't need the joystick option enabled in the preferences screen shown here:
Simply remove the keyboard assigments that are there for each item and then make new ones by pushing left and right on your joystick accordingly. Just make sure you save the settings before exiting. If you don't and just click close it won't save.
That said, I completely illiminated the page up and page down options on my cabinet and chose to have left=previous letter and right=next letter. That allows me to quickly jump up and down the list. Page up and down to me is useless.
Hope this helped.
DeLuSioNaL29