I'd like to get the color switcher back in the toolbox---pictured here in Painter 12, my previous version.Thanks!
I agree it could be handy but for me I made the "x" key switch between the main and additional color. (same as Photoshop)
[Shift + X] to swap colors does not work for you?
May I ask why you would like the color switcher in the Toolbox?
Also, you could make a custom palette and add the color switcher as an icon in the custom palette.