I think you can add BizHawk too, it works for coleco too, more options, but like Colem, some games are not working.
But I have a question, I have old Mame version (I m waiting for the next mGalaxy version to upgrade), so I haven't tested it since the mame/mess fusion. But it's not possible to select mame executable instead of mess executable to use Mame on the same way than Mess previously ?