And one final but veeery important question: what is the best way to make certain sections of the map impassible? Like, if I want to make a Hill one side of which I want to be an impassible mountain cliff, and the other a gentle incline, how do I make the first part impossible to pass. I can make one side steep and the other sloping gently, but the soldiers will walk across one as easily as across the other.

The way this was done in Vanilla was - well it wasn't done really because there were no impassible inclines, or any inclines at all (in the cities at least). What were impasssible were the buildings. So aside from creating a separate CAS for every little custom nook and cranny on the map, which would be a nearly cyclopean task, what other solutions do I have to limit where the soldiers can go (without using buildings)?