When sorting colors in the Color Palette panel I find myself needing to swap between “Copy Colors and blacken source” and “Copy Colors” frequently. These two functions are extremely useful.
If we could hold down a modifier key to call either function temporarily I think it may pleasantly smooth out and speed up the process of sorting/organizing colors.
Control is already in use for color picker, so my suggestion is control+alt for “Copy Colors and blacken source” and alt for “Copy Colors”.
Button states dont need to change while holding the modifiers keys but it would be a plus I guess.