When retouching skin blemishes, it would be great to be able to clone color and saturation and hue together, without affecting luminosity. You should be able to select which modes are applied to cloning, not just all or only one.
Maybe I wasn't clear. Often if you clone in only Color Mode, The Hue and Saturation need to be also cloned to produce a good match. Sometimes this is preferable to Healing Brush. I am suggesting that if you could clone (Color+Hue+Saturation) (-Luminosity) in one step it would be a time-saver.