We have icons for tank (shield), Healer (cross) and DPS (sword) in LFG/LFR. However, given that DPS can be both ranged and melee, it might not hurt to have on icon for ranged DPS (bow or one of the classic spells, like fireball).
This would allow people to choose their group make up, as sometimes you want a ranged yet all you are getting is melee or vice versa, and would be quite helpful since Druids can be either (Feral or balance), as can shaman (Elemental or Enhancement) and hunters (Survival and Beastmaster/Marksman). Some might be able to do both but be better at one, or be pretty much exclusive to one or the other.
This is more a quality of life fix, so no big either way but it is something to consider.