It's doable in the lava room.. but as others have said there is a potential to be flagged for swarming in a dungeon area. They are on a 72 minute respawn, so you'd effectively be locking down most of the rat spawns in order to accomplish this - something that would definitely upset someone who happens to log in the middle of your swarm and see no (or little) rats available to them for the next 72-100 minutes.
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