Are you absolutely tied to the idea of leading from your healer, too? I might be wrong, but the only real advantage I can think of is it let's you drop Healing Rain easily, though I may be missing something there (it's 5am, so I most likely am missing something obvious).

Some of the click through/repeater region stuff for healing I've seen demonstrated (for example in MiRai's Wrath Heroic vids) makes me wonder why you couldn't try to lead from a different character and still have pretty good heal control that way. Maybe you could even lead from a Hunter (if you were to use only one) seen as you're already used to not leading from the tank, to make use of the ground targeted AOE? The other thing that popped into my head, thinking of MiRai's vids, is the videofx layer he demonstrated for ground targeting, the idea is certainly there, but the viability in larger group and more intense situations would probably need considerable testing before committing to that type of change. Though for 5 man content it seems like it could be a great solution.

Again, just idea's for you to consider and curiosity for myself.