Yeah, MAME on RetroArch is one of the things I always go out of my way to warn people it's sub-optimal in some rather extreme ways. If they ever want MAME on RA to be anything but a third-class citizen, they're going to need to seriously rethink the libRetro API handling.
As for RA on XBOne, I don't anticipate it hitting any of the non-commercial licenses because there's no fee for the product on the Android platform via Google Play, and you won't even be able to get it from the MS Store (it'll require sideloading).
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Try checking the MAME manual at http://docs.mamedev.org
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