War cries / auras FTW. I am very much looking forward to furthering the support skills so we can see more engaged and useful support builds. I FULLY agree that this game is skill based and that needs to be considered when adding any skills that aren't implemented. With that being said, I think that healing is an excellent idea as long as it's fair and keeps the game difficult. Honestly, support players don't usually do much DPS, so, while healing might seem OP the player who's chosen the support path won't be adding much DMG to the party and by being in the party will have made the game harder. By that dynamic, there is already a slight balance. Overall, healing shouldn't be OP and I think the devs are aware that the players like the skill that's required for the game.
So, I agree that healing would be a nice addition as long as the game remains balanced and tough. The more support abilities the more team play is being promoted and that makes a game like this much more enjoyable.