Yeah but no ability to scope on a hero with a gun that has a sniper scope?
I think the heal is going to be a AOE thing like Soldier 76's canister that can be fired at a distance. Blizzard seems to like their hybrid healers that do the "boring" supportive stuff semi passively and asking support players to be greatly skilled at accuracy to heal their team well doesn't seem ancillary to Overwatch's hero design ethos.
I hope it's an AOE thing, especially if the other team has a sniper or two, you don't want your own team mates inadvertently making it harder for you to hit them as well. Could be like 76's heal or a healing version of Hanzo's sonar.