Saturation/Lightness/Hue Sliders

I've recently bought this and I'm using it for spriting instead of my old partner Gimp.
However, there is one thing I'm missing from Gimp, and that is Saturation/Lightness/Hue sliders. As it is now I have to replace colors one by one via "Replace Current color", which is fine if you're using only a few colors, but anything above 5 colors and it starts to get tedious. Is a feature like this something that is planned?