When viewing the zombie overlay there is a new button:
Using this you can designate zones for the zombie AI to gravitate towards, enabling you to create and move your own zombie hordes during simulation.
These are the kinds of tools that I built these new overlays for and I hope you enjoy the new ways you can interact with the sim!
Also in this patch: Lowered the urge to break doors and windows on the Zombie AI's list of priorities.
Changed files in this update