What are the valid values for roles?
In my old grid config I used to have a setup like this:
tanks, melee, healers, ranged, pets, ppl who are out-of-zone
When looking through the grid sources, I only found MAINTANK and MAINASSIST covered.
P.S.: Yes, this is useful info, because melee tend to get hit way more then say mages and therefore require a different style of healing. Also it is useful to have melee stacked in one spot, because I visually see, who is likely to get healed by say efflorescence.