in 1.7.1.4 me and my friend managed to prone/crouch walk through a little village full of zombies, looting everything and still didn't aggro a single zed. So it was possible and challenging. I see the biggest problem in some bugs like x-ray vision...with this its hard to sepereate if I did something wrong or the mod has just a bug. I mean, its very annoying when you sneak near a fence and the zed on the other side goes on full rage, even if you prone. I havent tested 1.7.1.5 yet but I like the change of the sound levels, in 1.7.1.4 it was sometimes a bit awkward when some zeds at the other end of the village heard you for no reason. I hope this is fixed but still very challenging. I think we need some changes in the damage system of the zombies considering the broken bones. They brake your bones too easy AND I think its not realistic at all, that they brake your leg! I would appreciate the possibility of a broken arm instead, so you cant use your primary weapon or a broken rip, so you cant sprint anymore (all this with still a chance of a broken leg of course, but the broken leg results almost everytime in death or respawn, because you dont have morphine). And dont say this would be too easy, it would still be very challenging but more realistic, and thats what i think the mod wants to be. :)