At some point, there has to be an options menu for sound (sample rate, turn off), screen scaling, and button assignment.
BTW, for some reason, "cps2emu.gpe" has lost its extension. If you want to use Gmenu2x instead of Selector (you should), just rename "cps2emu" to "cps2emu.gpe". Of course, selector will no longer work, unless you edit "cps2_config". Hope this helps
EDIT: Hopefully there will be a way to get to the Test Menu (F2 in MAME). If you play any of the VS games, you probably know why