Yes, in the preferences option (hit Ctrl-P to access it from within Maximus), go to the MAME lists. Copy the MAME.lst over to the favorites list. Make sure you configure a button to (add to favorites). Exit. Run Maximus. Rescan roms (right click and rescan). Highlight the game you want to add and press the add to favorites button you just configured. Open the favorites list and voila the game is added.
Note: After you add the game to your favorites, the rescanning roms will only overwrite the MAIN list, not the Favorites list. :-)
DeLuSioNaL29