While my idea sounds technically difficult, may as well suggest it. This would apply to any event that involves evaluation such as Campaign, Besieged, Walk of Echoes, and Reives. It's been stated that SE is afraid of giving support/healing jobs too much credit for their actions as it would lead to cure cheating and song/buff spamming. To combat this, I propose that any healing/buffing done on another character that has earned a higher evaluation gets some of their evaluation transferred/copied over to the healer/supporter.
This way, simply cure cheating or spamming buffs in a corner repeatedly does nothing, but spamming buffs/cures on a DD/tank targeting the mobs/NM/objective will yield a decent amount of points, like it should. I've recently done all of these evaluation events as a DD and Sch pair and it's kinda sad that the sch keeping me alive gets significantly less points excelling at their job versus me auto attacking and wsing.