I had played around with this when I saw the updated version from Ripper. However, it's nice to see that they just respect walls within the region so you don't have to draw an exact area. Didn't know about that part. Thanks for updating my brain
I wonder if you can combine this with 3DS Mindful encounters. Setting a turn to like 30 seconds and a patroling guard can only move xy distance, as well as the players. This would be closer to simualate a heist where the party can observe the routes and sneak past them or look for other things to do to go past the guard.