For a healer, you should use tank accessories. Your own life is much more worth then any other class in your group. So its better to let an DPS/Tank die first (Well that sounds a bit silly^^).

As a whitemage, i would not use my upgrade points for even more attribute buffs, because it makes more sense to upgrade the skills before everything else. I dont know wich skills a scholar does have in pvp so i cant really judge on that.