I took a look at the cutie video, and I must say that I did not see Deke Mclelland use the essence of what I mean. I confess [saywhat] that I didn't write it clearly either, and that I diddit on purpose [slick] to control [:I whether someone would try it out or not.
The essence is: the default setting of Photoshop is that there is a range of hues selected that is going to be changed, but to the left and right , there are sliders (the innermost ones) I slide these together, meaning that there's no more range, but only one specific hue.
And when I now mouse and click, I select the exact hue I want. When I click-shift-drag, I see the range get wider (the sliders open). So when I have finished, I have exactly these hues *I* wanted, not Photoshop's default!
As a dessert, I set the partially influenced hues, those between the triangles and the inner sliders, just as steep as I want, or even off.
This is really great as it gives us nearly absolute control over what we want to keep, and what we want to change.
Aahhh, Photoshop...
Hue Saturation trick 
And yes, it's very useful!
Linear Mode
