I would like to see the saturation slider being split into three sliders, similar to the Split Tone Adjustment, Low, Balance, and High.
Low is to control saturation in the low saturation areas and High is for the highly saturated areas. Balance is to control the saturation mask.
This would enable the user saturate the low saturation areas without affecting the already saturated ones and/or it will allow him/her to bring the over-saturated parts (clipped colors) to the desired level.
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Good idea, although what I would really like to see is general purpose masking technology, where one could fill out a form: "what do you want to isolate?":
* specify luminosities, saturation, color ranges...
* specify degree of focus
Then adjust whichever things however, constrained gracefully as specified.
Kinda like a smart-collection of discernable image characterstics meets U-points.