Best pc game in my opinion along with the call of pripyat. There are lots of people that still do mods for these games.
Recommend Zone of Alienation, if you want a challenge.
And you change little in "xr_danger.script"
Local def_ignore_distance_hit = 150
Local def_ignore_distance_hit = 15
or something similar, do so you can sneak better and that enemies do not discover you through walls. Have not really found the best value yet, started from 1.
You can also change the "m_stalker.ltx"
transparency_threshold is how easy the enemies see you through bushes and trees,
transparency_threshold = 0.9; 0.75
^ That value seems to work fairly well for [stalker_vision_free] (no intro of enemies)
is room for strap changes. Have not found the perfect host yet but, play around and try some yourself. Correct fun to see changes
luminocity_factor is how easy the enemies see you in the dark, the higher the valuation, the harder they have to see you.
Well this could not possibly be a user, but I will so easily by me.
Update: should also change eye_fov to somewhere between 180-230 if you made the changes mentioned above. Changes not eye_fov so the enemies will be virtually blind unless you are right under your nose at them.