I'd really like it to turn into something more insta-cast/mana saving or something that's sort of a single-target Medica II but instant. An "Oh crap" to Benediction's "Oh sh*t"
For the former, maybe work in a proc based on regen that make the current skill instant and no mana (sort of like thunder procs on BLM). That way it fits into regular healing as a mana-saver.

In the latter, it throws a medium-heavy heal and a short term regen. Has a ~1minute cooldown. Lets ya deal with spike damage with two advantages - it's quick and gets out there and it doesn't generate as much instantaneous hate as a really big heal would.