Currently, disabling zombie climbing is too restrictive. Zombies can’t use windows as alternative paths to the player, which often causes them to bunch up at doorways, get stuck, and hit each other.
I suggest an intermediate mode:
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Allow zombies to climb through windows and over low fences, but not over tall fences.
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Alternatively, allow climbing except over player-built fences or fences topped with barbed wire.
This would make fully fenced safe zones more effective while keeping scavenging runs dangerous.