> Like I said, my stance will be to encourage folks to compile for "Arcade" for now
> going forward unless of course they want to emulate a console system. I expect there
> will also be plenty of binaries released unofficially like that too.
I'm surprised you're taking this position. Playing console and computer games in MAME cabinets is quite a popular pursuit in and of itself, which is why many FEs already support launching other emulators besides MAME. Given that, it shouldn't be a huge deal to support MAME as one of those emulators.
As Haze and I have spitballed, the first FE that has QMC2's power and MAMEUI's idiot-proofness will take over the world, and potentially make someone some good money.