Paint all Armors at once#843

I find it somewhat tedious to click on each armor piece and model to change the color. I think to streamline it for the bulk of the painting an all amours paint would be helpful. Say it has 4 color slots and when you change say slot 1, all armors will have that color in their respective slot 1.
Another way to think of it goes like this. I finished making my mech and now id like to paint, but i dont want click through all the parts, so just to get a base color down, I replace the basic orange that a new mass comes in to a blue, so all of the orange is swapped and same can be said to the other slots/colors.

This can technically already be done by applying 4 different colours to each piece, creating a base frame which allows you to change the colour of that selected part ergo that colour slot.