@Kitru and Gamemeko:

I'm going to have to agree with Kitru here. Transitioning a PUG into a full healer is going to be rough. They really don't have anything that would immediately qualify them for the role. The skills you mentioned though do have a support element which could be transitioned into though. I think the ideas at play would work better if expanded into more of a DMG/Buff role, not entirely unlike Bard. It allows the PUGs primary reason for being (DD) to maintain, while adding in additional support capabilities. As with all support roles, they come with the caveat of working best in a group that they can buff up, but that comes with the territory. The balance is that a group of Tank/buff/DD/Heal must be more desirable than a group of Tank/DD/DD/Heal, but as long as that remains true, it should work fine and lessen the "necessity" of Bards by spreading the role around a little.

Plus, it's more easily messed with for the DF matching algorithm. Priority can be given to a buffer for the first DD slot and a pure DD for the second, but in the event of a lack of either, the other can be filled in accordingly without really changing the dynamic of the group play.

Of course, I'm biased. I'm not a proponent of hybridizing the classes in this game. It's just so easy to switch roles already that I think mixing and matching based on jobs is just not necessary. While some people don't like being "forced" to go back and level over, it keeps the available grouping population more spread out rather than clumped up at end-game.