I know Karina must be thoroughly worn out after getting the 2019 edition of Sasha ready, and I'm not sure if a "Misha" version of M4 is still in the works. But I wanted to say that the two things I would most appreciate having in M4 are (1) Easy Pose dials; and (2) the "Looks" indicators for the eyes.
I can put together a few Easy Pose dials on my own (without the more sophisticated rotation relationships and JCMs Karina put into Sasha-16). But I really have no idea how to get "the Looks" into M4. I could try copying the relevant bits of code in Sasha's CR2 file, but I'm guessing the positioning of the eye axes and diopter props is different for M4. I've never tried incorporating props into a rigged figure, but maybe it's something worth figuring out how to do!
Anyway, I just wanted to toss that out there in case a "Misha Lite" project sounds more doable than a full-fledged overhaul!