Updates for 5-1-14
Overlord Mata Muram will now allow a small amount of NPCs to be alive when you start the fight with him. Leaving a boss up will NOT end well.
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Love and
HateIMO, if all of the bosses are dead, and your train would not otherwise put you in jail (15 in pub or 100 in instance) it shouldn't matter how much trash you leave up. The limit and the despawn was designed to keep people from pulling OMM to aggro the whole zone. If you force people to kill all bosses before they can aggro OMM that will solve the issue without putting an arbitrary number on allowable trash to leave up...
Just a suggestion