Mod to reduce spawn rates - is there one or any in progress?

[peppergomez]

This game is great, but I would prefer a less aggressive spawn rate. There's a lot of detail in this world that I'd like to have a little more time to explore, and when I decimate a bunch of zombies in an area, I'd like to be able to explore without immediately having to kill a never ending wave of respawned zombies. IMO this would make the game a lot more interesting.

Does anyone know if this is possible, like say via a mod?

Thanks.