Emp, these rules aren't meant for zombie missions. If you want to use them for a zombie mission just to make the zombie not visible until LOS happens, that's fine, but that isn't really why I thought this up. You have to remember, you said it yourself, zombies aren't hunters, they roam around looking for opportunity. I don't really see the ZP as obsolete as much as... biding their time... until the opportunity presents itself.
Ya, games do take a while to play, especially with large number of players, but it is the players that drag things along. This function is primarily a ZP chore. He has to pay attention for when LOS is made, and he will make the rolls on his sheet. They can also play their cards as normal. The impact of this would all hinge on the players becoming overly cautious, nothing to do with the mechanics of the rule. Since you go "balls out", it'll take you a couple minutes to change the position of the zeds on the sheet, and then check LOS... that's it.
Ok... the "fleeting" LOS. I'll do the Heroquest example to make it easy, since it is a dungeon environment. You are going down a hallway and halfway down on the right side is another hallway to the right. You don't want to turn right but go straight, so you roll and move down the hallway, and thru the intersection. On your way thru, up the right hand hallway, there happened to be an Orc, and he is now placed on the board... eventho you leave LOS with him. You guys get it now? Now put that into LNoE terms when a Hero runs between 2 pieces of cover.
Vikinglad, while your idea sounds REAL kewl, here are the problems with it. Much like sound, the zombie is gonna walk over to the last place that he saw some food moving (you see it all the time in shows and movies), plus at this point, you are getting into Emp's fear and jacking up the amount of time it takes to play a game.
Now. Vike, I'm not gonna bail on ya... love the idea... and I am an idea man at heart. LNoE is such a complete game that it could be incorporated into an RPG. That's right... you heard me. If you guys are into playing survival/ horror RPGs or something along those lines, you could do all the RP'ing first and when the players are gonna move... break out LNoE to do the action. That way, game length doesn't matter, since you are doing a gaming session.
Oh, Emp, one last thing. The missing the search check and having all the zombies on the same board take one step towards the searcher. You can't do the same board, that doesn't make sense. You could have someone search in the hangar and miss, and a zed way on the opposite end of the board would move, but one 2 or 3 spaces away on another board wouldn't. That doesn't make sense. You need to have a radius that gets to move. If you want to do a set one of all zeds within 4 spaces move, there could be no argument with that. If you want to use the roll that the searcher rolled for his fail (4 thru 6 spaces... knocked over books to breaking dishes), that would really put the epic fail on the searcher. The last could be someone rolls a D6, and that number of space radius of zeds moves, and the 1 thru 6 could determine the level of noise made. Personally, I like the second one. Nothing like watching a player fail and watch the consequences at the same time... the head hang is wonderful!!
As for the zeds chasing meat, once the zeds know the heroes are there... LOS is made... the ZP can take control of them normally. These rules are only meant to be enforced as long as the zeds, heroes, or both don't know about the other. Once the ZP gets his zeds with LOS or zombie hunger... he has total control.