Skin tone eyedropper
Here's an idea that's been in the back of my mind for years now.
One of the first things one learns about color in color grading courses is that surprisingly, no matter the race of humans, the base color of the skin is in the same region of orange. It's why we have the "skin tone line" in the vectorscope. And it's one of the main reasons why the Teal n Orange look works and is so ubiquitous.
It also occured to me that while whitebalance is great to get neutral colors we still judge the final color a lot based on the skintones. And selecting white (or mid grey) on screen can be misleading unless you actually shot a greycard correctly on set in the same light.
So... My proposal is simple in concept. Add a Skin Tone Eyedropper in the basics panel. With it I could then select the picels I know are skin tone no matter what hue those pixels actually have. Lumetri would then push Whitebalance and Tint to move that hue over to the skin tone line.
Using some of your sensei magic you could probably combine whitebalance eyedropper values and the proposed skin tone eyedropper value to make a "Skin Pop" slider. Basically a powerful Teal n Orange slider that actually knows which colors are skintones and which aren't. Using the two eyedroppers.
But first things first, the skin tone eyedropper... It shouldn't be too hard to make and I imagine the benefits would be enormous since so much in color grading revolves around skintone anyway.