Sorry for my late answer - had a lot of work. My proposal is not only for select color of a lamp (colorpicker), but more for dynamic color change with combinators. RGB model is more simple to me, for example I can easily build combinators to show battery level (from green to red). I can likely solve...

TL;DR New "RGB" signal works as normal color signal, but when used in device with "Use Color" checkbox (e.g. lamp) device will use it value (with clamp [0, 0xFFFFFF]) to set custom rbg color. What ? Add new kind of color signal which can be used as RGB color value for specific d...