God, where to begin. Keep in mind, I'm a casual fan of the show. I like how they play with some of the morality issues, especially kindness vs. survival. Sometimes, I wonder about simply hanging cans withe pebbles inside on fishing line around the perimeter as an early warning system. Set it out 100 yards from your walls and you could have a patrol vectored in to eliminate the threat long before they hit the walls. Want to keep it quiet, so spear it, pin it to the ground, and chop the head.
Supply patrols make me crazy. They wander around unknown territory in condition white. Sweep the area, secure a building, set up overwatch, and search for supplies. Doesn't btake a lot of people to manage that.
A final note, I hate that they split up so often. This is a situation where strength does lie in numbers.