[jscher2000]

The White Balance tweak does add a menu item to choose among 5 profiles for white balance (such as Sunny, Fluorescent, or Incandescent). However, these choices do not appear to have any effect: unlike what you would see in a digital camera, there is no immediate, perceptible color shift when you change the WB setting or in captured images. The images occasionally differ in brightness, but colors appear virtually identical.

That might explain why this option was hidden. Perhaps someone who knows about the camera in the 800w can confirm whether it is capable of using white balance profiles.