White balance selection tools.

[Daltongang]

Although this has been brought up before, with no results, please add to white balance selector the options to set based on 18% gray, the photography standard, and black.  White isn't actually white in most cases so when a photographer tosses uses and old "white" device unless it is a calibrated low reflective true white, the results are off.  18% gray and high reflective black are options often used by photographers.  Low reflective 18% gray, has long been the standard for setting custom white balance.