I don't think it is. The OP wants a completely different set of colors for all the text types in the alt-k menu.
Maybe another way to explain/implement it is to not select the color for action text (or any other text) by clicking on one of the 16 squares below, but by having a color dialog (like the rightclick in the boxes) come up to select a custom color.
So, if someone sends you a text with ctrl-k codes in it, it's displayed in the corresponding colors from the 16 boxes in alt-k menu, but if they don't use ctrl-k, the Normal text color (and Action text color and ...) can be any color availiable to the system, not just one of those 16...
Hope this makes it more clear...
