I was thinking that it would be very helpful, on creating a modular and reusable show, if there was the REL button somehow also on the COLOR attribute. That way we could create effects that modulate also the color values of a fixture without having to make new cuelists for each color we want to modulate with a certain effect!
this REL attribute probably could have two alternatives REL HUE and REL SAT for hue and saturation respectively.
On my projects I have my color cuelists for my groups, faders for the master dimmer of each group and effects cuelists that sit upon the groups in an effort for efficient and reusable workflow!
The relative manipulation of the COLOR attribute would help a lot in that direction!!