I wonder if labeling the input and setting game mode allows full picture control settings, unlike Samsung.
I have owned a Samsung in the past, so I know how restrictive their PC and game modes are. The LG's allows much more control, but is not quite at Sony or Panasonic level. With the LG (off the top of my head) you lose motion interpolation and white balance control, and the color temperature is controlled by a slider rather than the usual cool, normal, warm, etc. The usual adjustments like contrast, color, sharpness, etc. are available.
I'm at work right now, but when I get home I can post a full list of what settings are available in PC+Game mode if anyone's interested.