This is just my opinion, but I'd much prefer a healer that deals damage to heal in place of another support healer a la AST. Something similar to Chloromancer from Rift, mechanically speaking.

Basically, it would have lower maximum damage potential than other healers but higher up-time to balance it out. Think something like Synastry on AST but instead of healing another person to proc the heal, you damage an enemy instead. Such that it could ST heal while DPSing but have to stop and cast to output AOE healing. It could be broken in all kinds of ways, but properly tuned it would bring something fresh to healing that might actually get some DPS to switch over and increase our ranks.