I feel horror is an important aspect in Project Zomboid and nothing is scarier than being surprised by zed. What I'm suggesting is that the zombies have more "states" than there are currently like the crawler state. It would be interesting at least as a sandbox setting to have the zed be capable of sitting down or laying down. Imagine a survivor going through a tight corridor and they notice a seemingly dead zed sitting against the wall. They carelessly walk past but suddenly the realize that the zed is very much "alive" and that they've reached a dead end. Surprise. This could also make the season of winter more dynamic. With the colder weather more of the zed would begin to freeze and slow down. These zed would awake when disturbed and entire hordes could rise from the ground in a frozen city creating that stressful scenario where you don't want to make a sound. This would make the zombies a scarier foe.
