In the 8-bit color palette, add a row that is the current cset. That way 8-bit tiles can also change color. 😉
Also, in the grabber, put in an option (w/o clicking "Leech"😉 to choose 4-bit or 8-bit color. And when you reclolor using 8-bit (by presing 'R'😉 it uses ALL csets.