In vanilla SWAT 4, you feel powerful because you have protocol. In the Zombie Mod, you feel terrified because protocol doesn't apply . You cannot arrest a zombie. You cannot negotiate. You cannot call for a peacemaker.
In vanilla SWAT 4, the is a niche tool used to secure a perimeter so suspects don't flank you. In the Zombie Mod, the door wedge is the most valuable piece of equipment in the game. swat 4 zombie mod
This is the mod for you.