Tanks should have their own variant of "Rescue"

[AdamFyi]

Admitedly, this isn't possible 100% of the time, most notably in Anyder (lvl 80 dungeon from 5.2) between the 1st an 2nd bosses, the walls arent high enough and the mobs can see you over them, so they dont move.

Actually you can LoS them. Once you head up the slope going up, keep running to the left until you’re about halfway between the corridor walls (but don’t actually go into that corridor) that leads to the second boss. Then you just double back and pull the pack towards the casters who should be just about gathered near the top of the slope and running towards you but stopping at the pillar.