I have a merged romset. It saves space, and makes sense. My arcade machine is almost completely set up. There are child roms that I want to play instead of the parent rom, such as Sunset Riders where you can not pick any character in the 4 player version so it does not make sense on a 2 player cabinet.
How can I have attract mode or mame pick the correct version for specific games?
The only way I see is to manually edit the rom name field in the romlist.txt file.