No it does not
Try it yourself, set different white balance for two different shots, and look at raw data.
from the people who designed the camera.
Please explain analog signal processing in this case more specifically.
H,H: The acuteness of the tone curve is directly related to the minuteness of signal partitioning. The more acute the gradation, the more precise the luminosity measurement. With conventional digital cameras, reproduction of gradation depends solely on the results of digital measurement, eventually causing gaps in gradation.
To minimize such gaps in gradation, the D2X introduces our unconventional approach of analog adjustment for white balance in the first stage of signal processing (believe this is AD conversion as it was explain to me). This approach helps to achieve smoother, more accurate gradation than conventional digital cameras are capable of,
for smoother display of tones from highlight portions to shadow portions of the image. With optimized distribution of analog and digital white balance gain, the new engine produces smoother gradations with consistent and smooth transitions, all with exceptionally pure color rendition."
It was explain to me part of the white balance information is used to boost the gain to a individual channels this part of the white balance information is none retrievable and uneditable the remainder of the white balance information you can edit as normal in the raw file.
Phillip