I hate Ghimlyt for this reason. In a stationary situation X button does prioritize objects and NPCs. Problem is, it prioritizes them in a dungeon too. And unfortunately due to certain ARR and HW dungeons where you actually need to heal an NPC, I don't have it filtered out. There's also a setting you can adjust that auto targets either whats visually closest or...what you're facing or something like that. Rule of thumb tho: up and down on the D-pad cycles thru your party. Left and right cycles thru enemies on the field (and if you don't have it turned off, NPC player characters too I believe). Targeting there isnt too horrible but in a large pull it can be hard to target when you're going for the meatiest or most central ad for DoT spreading and such.