MVSPSP 2.3.1..Can I add roms that aren't on the gamelist??

When I downloaded MVSPSP 2.3.1 it came with a game list of roms that can be played. Seeing as there many more exist..is it more a trial an error thing? Or can MVSPSP 2.3.1 onlyplay the roms located on the gamelist? Could I just type name of rom onto the game list myself then it will add it? Allowing me to play it?HoustonTX224

The answer, sadly, is no. Unless you can modify the eboot and remap the games that it supports, you can't add any MVS games that are not on the list.