STALKER Clear Sky Mods – How to Run Without Screen Leaning

Maybe I found something around (and your idea is awesome, actually)

In your GMOD installation you should see a folder like this: lua/autorun/server/

Create your LUA script (noguns.lua) with a text editor and paste this in:

function StripAndGive(ply) 
    ply:StripWeapons() 
    ply:Give("weapon_physcannon") 
    ply:Give("weapon_gravgun") 
    ply:Give("gmod_toolgun") 
    return true 
end 
hook.Add("PlayerLoadout", "StripAndGive", StripAndGive) 

After you save the script, move it in the above folder. The source is this thread and it's 4 years old. So this may not be working properly (or at all) but comes with a nice scripting guide.

Did you look at their official website? http://www.moddb.com/mods/stalker-complete-2009

It pretty much tells you what they change, including the gameplay stuff that makes the game easier.

In general the greatest change by far that I felt made the game much easier is the distance at which enemies spot you, which has been greatly reduced. This is not just good for stealth—you can now take out enemies at a distance even with fairly average weaponry like the AK-74 (with attached scope), before they even notice you. In the vanilla game this was impossible unless you were incredibly lucky, because of the game's ballistics system.