Ahhh, now thats really counterintuitive!
You'd think that spawn 0 would mean no spawn but it means massive spawn eh? I noticed because I had 5 rebel armies spawning into my turkish occupied Ryazan every single turn....

So 200 is the value I'm aiming for to completely shut them or do I have to edit the regions file to disable them? Rebels just get annoying once you own most of the world. Having to ensure unblocked trade roads every single turn is tedious huh?

Thanks for the replies!