MAMEWorld Forums - EmuChat - Choosing explicit LAY file

When I use LAY files to display artwork, MAME always uses the file "default.lay" in the folder/zipfile that has the same name as the ROM. So, if I play sf2ua, MAME will automatically load "artwork\sf2ua\default.lay" (or "artwork\sf2\default.lay", the name of the parent).
Is there a way to explicitly choose such a file (or its folder/zipfile) through the command line options or mame.ini?
Something like:

mame sf2ua -lay mystuff
(which would take "artwork\mystuff\default.lay"

or

mame sf2ua -lay mystuff\layfile.lay
(which would take "artwork\mystuff\layfile.lay"

Something like this could be needed if you have one artwork for several games that still don't have anything to do with each other. Like if I play fighting games (Street Fighter, Mortal Kombat), I want the same artwork, and if I play jump n runs, I want another.