If I can make a suggestion: perhaps like what you did here with Bias, Bill:
market.renderosity.com/mod/forumpro/showthread.php

I keep refering back to those sorts of things. We could have a section on Bias... or we could have a section on how to shift colour values.

For example, I've been wanting to shift colour values for a skyDome image: I want to be able to incrementally darken the image within the shader without loss of image quality. It plugs into the Ambient_color channel on PoserSurface. Dusk is approaching, so the stormy sky needs to be darkened.

I get the impression from my renders that simply lowering the Ambient_Value number degrades the image quality, which i don't want.

I have no idea whether my conclusions are even correct... this is just my impression.

But anyway, I see an application of the Bias node, here, potentially.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks