Hi!
Don't know if that is the right place to post feature suggestions. Apologies if not. Or maybe/hopefully it's in the works already?
If not I'd like to suggest a color picker for white balance.
Also, there doesn't seem to be an option to remove/shift the green/magenta tint.
I'm used to a white balance color picker from other "renderers" and post production tools. (e.g. vray, octane, redcine, etc.)
In case you're not familiar, a white balance color picker lets the user pick a color in the render output (i.e. the vfb) and automatically compensates the cameras temperature and color tint values to make the picked color white (or any other "color-less" shade of grey).
I can only speak for myself but I think that feature would make working with color balance A LOT easier.