I'll talk this over with our firmware designer. I believe most of the things you're asking for come standard as part of the HDMI2.1 spec and the latest spec seems to be HDMI2.1a. As of right now, we are only compliant up to HDMI2.0 due to the nature of our commercial market. They prefer reliability over cutting edge. However, I don't see updating to the new spec as a major issue. High-end FPGAs have really come down in price and have made it much easier to accomplish such tasks due to their high throughput capabilities.
Don't just do the bare minimum VRR support to be HDMI 2.1 compliant though. The spec only requires a very narrow VRR window. Lots of cheaper devices make this window 48 to 60 hz, even when the display itself supports fixed refresh rates up to 120 hz. VRR should work anywhere from 30 all the way up to the maximum refresh rate supported by the TV. That is why I mentioned the G-Sync/Freesync Premium certifications.
