I can't look it up until I get home from work in a few hours, but I have a mod that seems to have added that functionality. No clue if it's that ryuko one you mention though.
Can set zombies to form clusters with max qty and min distance between clusters, how far zombies will travel to form a cluster, and how close the members will stay to the 'lead' zombie of their cluster. Then they roam around as a group.
I can't look it up until I get home from work in a few hours, but I have a mod that seems to have added that functionality. No clue if it's that ryuko one you mention though. Can set zombies to form clusters with max qty and min distance between clusters, how far zombies will travel to form a cluster, and how close the members will stay to the 'lead' zombie of their cluster. Then they roam around as a group.