Time out idle newbie rooms
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When a new player spawns but then doesn't do anything, they occupy a possibly in-demand spot on the map, and use up their one-time-only 3-day safety walls. This is bad for everybody.
I'd suggest that if someone spawns for the first time, but then has no creeps or structures for, say, 3 hours, they are cleared from the room, and the remainder of their 3-day safety period is preserved for when they come back and respawn. This would benefit both the inactive new player, and other players in need of a good place to spawn.