I just made a medium.cfg file ;)

aiming visor (crosshair) is now visible as well as other hud things.
image_lodbias set 0 is most important for reading text and better textures... setting this to 2 gives very ugly textures <- none almost

Also some other things enabled

It does give a few more frames per second which I can definetly notice and see in the show fps thing
sometimes it even doubles the frame rate... from 15 to 30 in small corridors

set image_ignoreHighQuality "1"
set image_downSizeBumpLimit "512"
set image_downSizeBump "1"
set image_downSizeSpecularLimit "64"
set image_downSizeSpecular "1"
set image_downSizeLimit "512"
set image_downSize "1"
set image_forceDownSize "1"
set image_lodbias "0"
set image_anisotropy "0"
set image_filter "GL_LINEAR_MIPMAP_NEAREST"
set image_roundDown "1"
set image_useCache "1"
set image_cacheMegs "64"
set image_cacheMinK "4096"
set image_useCompression "1"
set image_useNormalCompression "1"
set r_preload "1"
set r_skipBump "1"
set r_skipSpecular "1"
set r_skipOverlays "1"
set r_skipFogLights "0"
set r_skipPostProcess "1"
set r_skipBlendLights "1"
set r_skipDynamicTextures "1"
set r_skipMegaTexture "1"
set r_skipTranslucent "1"
set r_shadows "0"
set r_useOptimizedShadows "1"
set r_useTurboShadow "1"
set g_bloodEffects "0"
set g_decals "0"
set g_showBrass "0"
set g_muzzleFlash "0"
set g_doublevision "0"
set g_showPlayerShadow "0"
set g_skipFX "1"
set g_skipViewEffects "0"
set g_skipParticles "1"
set g_projectileLights "0"
set g_doublevision "0"
set ui_showGun "0"