Block bots from spawning within a zone?
Is this possible? 
There is a flag for no NPC spawn but I was having an issue with that recently with no replies.
I should specify they're not normal NPC's, they're bots from botspawn. 
The person who makes the mod that uses bots says that ZoneManager references NPC players only one time in OnEntitySpawned. He said it should kill those bots (e.g. obey ZoneManager) unless those bots wander into that zone.

I was waiting for a response from him. Sorry for the delay.

Have you made your radius zone large enough?
yes i did. :/ I'll figure it out eventually.