The "Ray of Hope" modification is the dream of the most in the S.T.A.L.K.E.R.'s community, it's like the name says. This mod gives you the possibility of surviving in the zone with your team-mates, with not only NPC, but also other players.
Screenshots taken of CBT test, NPC and Player characters a like.
You see Ivan when you hold peestol like this you never shoot the inaccurate for fear of losing your fingers :D