I've just downloaded 4.12 and I'm quite impressed with the improvement to reflections. Finally we can correct mirrors without a lot of fuss =D
One thing that I was reminded of though, was that it would be very useful to be able to adjust the saturation of each reflection capture. As an example I have a scene that has mostly fairly neutral ligthing, but one part has a lot of beige light coming from the ceiling, and while I want to have a bit of a beige tint to the reflections, it's too much as it is now. The whole floor gets a kind of dirty, beige colour. If I could adjust the saturation of that particular reflection capture, I could get a good blend that would make that part of the scene look just a LITTLE saturated. See pictures below.

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