At least the MV-1B is mono JAMMA only. I think the earlier, larger one slots had a switch (far better boards IMHO, though much more cumbersome).
I can't speak for eveyone but I know I don't want to mess with wiring in my cabs for MAME. I run both MAME and JAMMA. MAME is mostly for testing ROMs I dump to repair boards but I sometimes use it to try out games I am thinking of buying.
Regardless of that though, 90% of JAMMA cabs (not JAMMA+) out there are mono and I recon it'd be pretty useful to just hit up an option for those not really careing about stereo/wiring to hack up their cab.
http://www.youtube.com/retrorepair
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