Drag vectorscope to adjust white balance / color calibration

[RUDANTU]

Is your feature request related to a problem? Please describe.
Color calibration / white balance adjustment is a bit slow to interact with.

Describe the solution you'd like
User can click and drag the vectorscope to adjust white balance or color calibration hue/chroma, seen in attached video. This let you make quick, intuitive and precise changes using the mouse.

Perhaps keyboard shortcuts could also nudge this - similar to keyboards seen in Fuji Frontier scanners:

Alternatives
I can't quite think of any..

Additional context

Darktable.white.balance.enhancement.mp4