Sorry if my Subject Line above doesn't describe what I'm trying to say, but here it is:
In Photoshop, one of my favorite techniques, even if seldom used, is to color-balance in Levels, using each color channel in conjunction with the Alt key to show me the darkest and lightest pixels in each channel. So far, I have found no way to do that in LR. I tried Curves, using the R, G and B curves but the Alt key has no effect. Dragging the endpoints of the curve in each channel seems too crude to use without seeing the brightest or darkest pixels.
Dragging the ends of the histogram works with the Alt key, but of course you can't adjust individual channels there.
Is there any way to accomplish this in LR? And if not, is there anything about LR structure that would prevent this technique from being written into the program? And if not, maybe some kind of simulation of it?