1 is for fact that zombies can somehow see you or hear you if you are in house(that is if you both are right next to each other and there is only wall separating you) 2 it happens all the time 4 ok its like this : once you have stand up from prone and zombie is very near from you it will only hear you not see..so as long as you dont make any sound youll be ok..but you could make it so that if you are in zombies line of sight it slowly changes his path -> towards you 8. in small towns like balota, kamenka ..and others there are a lot more zombies per square meter than they are in chernogorsk or electro..smith..so basically i would like that you make big cities more dangerous not easier(besides in apocolypse thats how it would be)