Changes so far:
minDistanceToSameTypeStructures JSON key for a minimum distance between same structures, see templateThis mod is server-sided, which means it does not need to be present in clients if your server wants to run it.
You can find a guide on how to use the mod over here.
If you made any cool structures using Pillar that you want to share, I recommend putting them in the World Gen category of CurseForge's Customization section.
Pillar is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license.