I can only speak of the ColorBurst RIP which I have dealt with. And it depends on which version you have. The Queue series from ColorBurst does not have an interface for inputting curve values. The Layout series does have a “color adjustments” dialog window that allows the editing of curves - at least it did with the 8.7 version I tried a few months ago. I’m not sure if the latest version 9 has this ability.
