FWIW, starting any AES game with "full path" using the ROMs from MAME doesn't seem to work (tried some, but I don't have b2b)... even from ZIPs, although I don't get a device initialization error in this case (the screen just stays blue). So apparently you have to use the SW-list here.

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]