Chris, I don't know if you are familiar with the Color DMX 150s (discontinued), but with those fixtures, the master (head 1) would control the other three lights (heads 2 3 and 4), but not all of them would just change to the same color at the same time. There were color change patterns and chases that were quite nice and easy. Not really master/slave in the usual sense.
I'm sure it's just wishful thinking, but I was hoping that ADJ had included that very nice feature to the Trispots (or some other light).