That is good to see opinion like this. I'm myself a stalker fan and I really want to see real world weapons in game and some unusual but no fictitious guns that can be made in years after apocalypse. customization is very important too because it makes each player Make his/her choose to improve his/her weapon the way he/she want. for example someone that want silent approaches to targets can customize his/her weapon's with silencer and other stealthy components.
I wish Developers of game visit this Thread and threads like this to see what players want from the Game.