If you use the mamewah config with 1.6 you can change it to do page down instead of going to next letter like the default
In the config go to Global settings tab-then click the controller button (you may have to "install" a controller i just put pad)-this should say "edit controller"-on the global tab check the box that suits you (i use all three mouse kb and joystick)-then click the controller tab and you can set the settings on pg down pg up one item down one item up etc.
Hope this helps I was never good at explaining things if you need more info i will try to do a screen shot walk through
Woof