Letting you target the spell after the cast finishes instead of as you start it seems a bit strong; it turns it into an instant cast with charge up time, if you get what I'm saying. That's bad because A) it probably makes it a little TOO easy to heal, and B) it would likely be easy to game the server latency on spells like Twintania's fireballs, for instance. Start casting the spell 5 seconds before she fireballs, wait for her cast to be just about to finish, then cast. Due to latency the spell will resolve immediately AFTER the fireball and bam, everyone's topped up. Doesn't seem like a big deal there, but it's big if that same fireball effect also applied some sort of debuff that affected heals, the spell will top everyone up before the debuff is applied. It's too easy to abuse.

I'd be amenable to a Cure 3 spell that targeted the ground instead of a player, but left the selection of the ground at the beginning of the cast instead of holding it till the end and added a small ground effect. I say small because too many effects make the game too cluttered for those with good computers, and unplayable for those with bad computers.