Is there a way to disable the mummies?  In my server config, I have +halloween.enabled false, but that doesn't seem to do anything.

Got it:  halloween.murdererpopulation 0

Edit:  Well, that didn't work, either.  Anyone else know?  Even checked the population in the console and it states there are 0, yet they're running around the server.

halloween.scarecrowpopulation 0

No worries.  That setting will also turn off the chainsaw guys that throw bean can grenades. 

I think Facepunch had a different NPC planned but decided to switch gears without changing the name.