Thanks Taf, so not all softlist roms tested but a-c at least, which I've summarized in this
mametesters report. Feel free to modify the report as you see fit. I did get a few titles to work since my post above, as some actually start with the number pad which I hadn't previously realized (though it makes sense considering the host platform). Although, that still leaves only about 50% of the titles as actually playable which I think could be more accurately be documented as "imperfect" or "preliminary" status of the driver overall.
I also noticed this
separate issue report providing exhaustive test suite results that also seem to support the need to bump status down.