HowTo? use UniWb with less color cast?

[l_d_allan]

From earlier post related to "RAW histogram"
http://www.magiclantern.fm/forum/index.php?topic=3924.msg21395#msg21395

For now, the closest approximation is UniWB. ML will reduce the green color cast, it's not perfect, but better than nothing.

ML newbie using 2.3 on 5d2

I infer from the above, that ML has a way to use a UniWB custom WB, but to adjust the LCD display so that the green color cast is less of an issue.

Correct?

If so, how? This ML newbie hasn't noticed how this is accomplished.

[a1ex]

It's only in the nightly builds.