meh buff the snot out of the melee, go make a sannich while they get you your loot. /pikemode on.
seriously though, you can waste a lot of spell points with little to no gain there. i concentrate mostly on buffing (keeping everyone hasted / displaced / raged) and pick and choose my places to strike. A cone here or there to soften things up, a little irresistable for kicks (do it to the melees too a la kormor's belt), most of the quests have great little spots for dumping sp, bide your time. let the melee have their fun, we been burning things up for a while now. time for a break
