True horror

[Emp]

Nope, sorry I can't find myself in these rules.
To complicated wich takes out the basics of the game. It's supossed to be an action game and not an RPG game.
I'm not big on RPG games because it just wastes to much of the little free time I get to spend on playing boardgames

Even so making it a "non zombie mission ruleset" will be even more confusing, or don't you plan on playing the ones that come with the game?
For example the scenario where the heroes have to blow up the spawnpits. How could a zombieplayer prevent this when he is not allowed to move his zombies where he or she wants?
My tactic as a zombieplayer with those rules would be simple...just stand still and don't bother with walking to a random place and then they will all stand on the 4 different spawnpits.

Sound & vision wise zombies atract eachother as wel. When one moves others will surely follow.

To be honest I'm not sure this way you will get the "OH SHIT" result you are looking for.
LOS will have you spot the zombies once and then they stay on the board, unless they get killed wich makes them dissapear again.
But due to the lack of movement for the zeds there is hardly any chance they will have the jump on some unsuspecting hero wich could result in instant death.
A hero spots one...by the time the zed gets across the room the hero can be long gone again.

But it's your house, your rules so try them out and see how it works.