Technically impossible with a mutator and ReservedSlots is a mutator. A connection attempt to a server will fail if all slots on that server are already occupied. You will directly get a server full message without even seeing the connection or map download screen. In other words the server and thus any mutator running on that server won't even know that someone did try to connect. This is why the ReservedSlots mutator locks a minimum of 2 slots. Those 2 slots guarantee that players can still connect to the server and allows the ReservedSlots mutator to decide if that person is allowed to stay or if he should be removed (Server full).
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