More accurate way for slight adjustment on Hue/Saturation

[Reekin]

This is an amazing extension that helped me a lot, thank you!
It brings some advantages to put the Hue and Saturation together on a 2D wheel surface, but the traditional way that uses individual sliders is also essential when I want to adjust the Saturation or Hue slightly. It is inconvenient to do adjustment on the current wheel.
Is it possible to add 'Saturation' and 'Hue' slider ?
Another potential way is adding a "Zoom IN/OUT" feature to the wheel.
Thank you.