here is what the video.txt file does

"VideoConfig"
{
   "setting.cpu_level"            "-1"      //Effects /0 = LOW /1 = MEDIUM /2 = HIGH
   "setting.gpu_level"            "-1"      //Shader detail /0 = LOW /1 = MEDIUM /2 = HIGH /3 = VERY HIGH
   "setting.mat_antialias"          "0"         //Anti-Aliasing smoothing edges 0, 1, 2, 4, 8, 16
   "setting.mat_aaquality"          "0"         //Anti-Aliasing Quality 0, 1, 2, 4
   "setting.mat_forceaniso"          "-1"      //Anisotropic Filter 0,2,4,8,16
   "setting.mat_vsync"             "0"         //vertical syncronisation /ON = 1 /OFF = 0
   "setting.mat_triplebuffered"       "0"         //Triple Buffering /ON = 1 /OFF = 0
   "setting.mat_grain_scale_override" "1"         //Removes the grain effect on the screen.
   "setting.gpu_mem_level"         "-1"      //Model-/Texturdetails /0 = LOW /1 = MEDIUM /2 = HIGH
   "setting.mem_level"            "-1"      //additional memory
   "setting.mat_queue_mode"      "-1"      //Multicore Rendering -1, 0, 1, 2
   "setting.csm_quality_level"      "0"         //Global Shadow Quality /0 = LOW /1 = MEDIUM /2 = HIGH /3 = VERY HIGH
   "setting.mat_software_aa_strength"   "1"         //smoothing edges factor 0, 1, 2, 4, 8, 16
   "setting.mat_motion_blur_enabled"   "0"         //motion sharpness 0, 1
   "setting.fullscreen"            "0"         //Full screen = 1 /Windowed = 0
   "setting.defaultres"            "1550"      //resolution screen x-Ax
   "setting.defaultresheight"         "960"      //resolution screen y-Ax
   "setting.aspectratiomode"         "2"         //Screen ratio /0 = 4:3 /1 = 16:9
   "setting.nowindowborder"         "0"         //No border limitation in windowed mode /ON = 1 /OFF = 0
   "setting.mat_monitorgamma"        "1.6"       //screen brightness /1,6 bright /2,2 dark
}

here are the settings i use

"VideoConfig"
{
	"setting.cpu_level"		"2"
	"setting.gpu_level"		"0"
	"setting.mat_antialias"		"0"
	"setting.mat_aaquality"		"0"
	"setting.mat_forceaniso"		"16"
	"setting.mat_vsync"		"0"
	"setting.mat_triplebuffered"		"0"
	"setting.mat_grain_scale_override"		"1"
	"setting.gpu_mem_level"		"0"
	"setting.mem_level"		"2"
	"setting.mat_queue_mode"		"2"
	"setting.csm_quality_level"		"3"
	"setting.mat_software_aa_strength"		"0.000000"
	"setting.mat_motion_blur_enabled"		"0"
	"setting.fullscreen"		"1"
	"setting.defaultres"		"1440"
	"setting.defaultresheight"		"1080"
	"setting.aspectratiomode"		"0"
	"setting.nowindowborder"		"0"
}