This looks right up my alley. Does it properly support true monochrome raw DNG files? I.E., cameras that don't have a bayer filter and don't require a debayering pass. I'm shooting a Pentax K3 Mark III Monochrome, although Leica has a couple true monochrome cameras and there are services that will de-bayer cameras and modify the firmware to achieve similar ends.
Also there are the Phase One Achromatic backs. Which Lightroom does not even support :(
Yes, it properly supports monochrome DNG and disables (and hides) tools that are not applicable such as demosaicing, CA correction, highlight recovery, white balance, etc.
I didn't know such firmware hacking was available. I'd been waiting for the GR Monochrome for years but it's a bit expensive for me.