Normally it'd be "whoever CAN move without losing DPS, moves." This means BLM, then most of the casters, then healers, are lower on the "needs to move" priority. For my static, since one of our members has to deal with AUS ping, it's "[RDM] doesn't move, everyone adjust." It's lead to a few "The only people you can't bully out of [E12S Titan Marker Spots] are [RDM] and [PLD]."

...for everyone else it HAS led to a couple "Stop chasing me!" "No, you're chasing me!" moments.