Doesn’t MAME need some clones to function properly? It seems like it’d work better if you tell MAME one folder for toms and ES a different one then put a text file for each non clone game in the es rom folder and tell es that roms are *.TXT. Then it maintains dependencies (like needing Puck-Man for Pac-Man) but only shows one (Pac-Man but not Puck-Man.)