As of now I know of no way to do that. I would love that ability too if anyone knows how.
It is funny messing around with the color settings on my TV; I can move the 100% secondaries but not <100% so I can get very curved saturations or less curved but never a correct 50% value (like your cyan). It ends up looking better if I leave the TV's settings alone and use MadVR to do any corrections as the <100% values are closer to what MadVR expects based on the primaries.
This is after I figured out a full calibration, I do get pretty good (<4dE) for everything but blue (17dE at 80%). It would be great to be able to use more or all of this information in MadVR but I imagine that would be a pretty big project.
