That would be something new, huh?
I thought about this for a long period of time. I haven't been into raid instances, but played a lot in BGs, so I dare saying that it is the same thing. Now wouldn't it be possible to cast tranquility on all of the raid members? Would it be over-powered? "I can heal my party members and the others...***** them", that's what it seems. I doubt Blizzard will ever think about this, but I'd really enjoy.
(Just imagine...AV with 5/8 druids on resto, each casting tranquility only...)
At this moment i am feral spec, and this spell heals for 785 HP/tick. I doubt it's much, but in desperate situations, works just fine. And I find it better than HoT and H Touch. Of course, this is irrelevant.
What do you think? Would it be a good investment?