Dwellers assigned to this room will patrol the vault and run to any area under attack. This way players no longer have to worry about the Molerat dessimating their entire vault problem if they happen to walk away with the game running. It also beats placing guards in every non-production room to defend against a molerat invasion.

You kinda stole my idea. I kinda posted this in the main suggestion thread basically... But ye'h. I support this idea.