Actually guys, it's not that obvious!
Here's what I did for the gameboy emulator:
copy gameboy-0.ini to gameboy-1.ini
Manually edit gameboy-1.ini to give the list a title
glaunch mamewah, go to the gameboy emulator, press 2, and since we now have 2 ini defined, we have a "select game list" option which didn't exist earlier.
Define the game list as filtered and voila, your list is clean.