hi cameyo
I’ve been painting digitally for several years and it strikes me odd that nobody else have produced such a feature for photoshop… nor even requested one… as far as i know…
Most of my requests are based on stuff I’ve found in other programs such as zbrush, deeppaint, Painter etc. But I’ve not to this day seen a tool that provides the best of all worlds…
What it all boils down to, is the need to have more precise color picking controls in Photoshop. Photoshop does have a rather complete set already but the way you access it is just too slow and cumbersome. Espeically if you are a 2d/3d artist like myself.
What I had in mind is rougly something like this…
A nice layout of a few large colorwheels would be great. Some 'sticky’sliders that will control the brightness, saturation and hue respectwould be awesome to have. Some of the stuff you have in your small scripts would be invaluable too - like complimentary/oppostie colors, harmony colors etc…
Do you ask because you have time to do such a plugin yourself (here’s hoping) or is because you know of such a plugin?
If its for the former reason I could produce a mockup of a layout for you decribing in more detail what I had in mind.
cant wait to get feedback… 
Until then,
;Peter