It only applies the 80% mana reg buff to targets i heal with single target spell - in the description its written that my heals apply the manalized buff to the targets of the heal ... so a mass heal like crimson / dark prayer should apply this buff to everyone - but it seems as if its not working.
Or it only applies the buff, when the target is actually healed - is it ment to be this way? because then it would be useless for every ranged player i heal with aoe for this buff ... actually for everyone it would be useless except for the tank most of the times