It would be nice if it was possible to point at a dat file and have it treated like a bios-based system is right now. It would make is a lot easier to keep sets for emulators that share roms with Mame in their own directory and also define systems, such as CPS1 that do not use a shared bios. I used to do something like this manually where I would remove the sets in a different dat but it is hard to keep up with each release and would be nice to see automated.

ac.