Here is high settings. These are the highest you can get without modding the game files.
Code:
//=================== video settings =====================
@v.gamma = 32
@v.sx = 1680
@v.sy = 1050
@r.sky = 1
@r.realshadows = 1
@r.softshadows = 1
@r.projectives = 1
@r.motionblur = 1
@r.cameramotionblur = 1
@r.diffusemap = 1
@r.normalmap = 1
@r.specularmap = 1
@r.waterreflection = 1
@r.waterenvreflection = 1
@r.view = 4
@render_vfx = 0
@r.viewkoef = 1.000000
@hitfx_lifetime = 30
@r.shadermodel = 4
@r.anisotropy = 1
@r.antialiasing = 0
@r.vsync = 0
@r.fur = 1
@r.postglow = 1
@r.caustic = 1
@r.aspectratio = 1.600000
//=================== game settings ======================
@auto_weapon_switch = 0
Diffuse lighting is turned off by default and there is no way to turn it on in-game. You must turn it on in the .cfg file itself. This feature is very CPU intensive however. I warned you.
NOTE: I would not recommend simply copy/pasting this into your .cfg.