i would lnow a way, but its sort of complicated (but its easier than copying the new wad over). Download COMI (from www.gp32x.de) and download all wads and rename them to Doom3.wad, doom4.wad and so on (remember that Doom2.wad shouldnt be used) then if you decide to run the western wad, you launch comi, and rename DOOM3.wad (which i have as the western wad) to Doom2.wad. then you can turn off your GP32 and turn it on again. after that, you can start GPDoom, and voila, you can choose the western wad.