This is a re-run of my large conjoined thread - https://rocket.unrealengine.com/questions/1841/feedback-my-next-round-of-contenteditor-feedbac- broken up in different threads as per request of Alexander.
In the texture editor:
Set a channel to the Red channel only, then deactivate the Saturation button => Shows red channel in red color, even though saturation is off. Now enable Saturation => Now shows solid red color filling the entire window, which is entirely useless. I’d like to have UE3 behavior here, where it would made each channel grayscale (as expected) when saturation is disabled. I use a lot of mergemaps, I find it difficult to judge them when they are colored.