Hello!
I use the targeted adjustment tool A LOT. It would be great if I could access all of the parameters of an adjustment with the targeted adjustment tool with key or click modifiers when the targeted adjustment tool is active.
For example:
I have a Hue/Sat adjustment layer selected with the targeted adjustment tool active, and if I hold down option or command while left clicking on an area of the image I am trying to adjust I will affect the Hue, or Brightness parameters rather than the saturation parameter.
As far as I'm aware I can only affect the saturation parameter with targeted adjustment tool, and it interrupts the color correction flow when I need to go back to the adjustment panel and select the number field of parameter and use the arrow keys to dial in the adjustment so my attention stays on the image.
The now defunct Modo (RIP) had a nice feature (omni haul) that allowed the user to easily setup different click behaviors that affected different parameters. You can see a video demo of it in action here.
This would allow the user to keep focus on the image, without needing to go back to the adjustment panel. The only drawback would be the tears of joy they cry at the revelation of such astounding efficiency would likely affect their color vision adversely.