EBJohnson

At the very base, just a way to map the Color Balance adjustment layer would be enough… just an XY axis for that control would be 90% of what’s needed.

Apologies, I thought it was a known thing. It's a pretty standard color correction model in video... I've attached examples from... a version of Resolve and FCP7. Basically color wheels tied to shadow/mids/highlights and in resolve, though not pictured, there's also a global corrector. Capture One also has a similar option. It's very useful for eliminating color casts, since it's not tied to a single RGB channel. The addition of lightness/saturation, per range, sliders are also nice for fine tuning the correction. Think of it as a different GUI approach to the Color Balance adjustment layer. It could just be a toggle in that tool... since it's function is so similar, but again, you can get faster results by being able to control all three color channels at the same time.

Hopefully I didn't miss an existing request... It would be great to have a 3-way color correct adjustment layer. It is maybe the one corrector I miss the most from Capture One or Video suites. Thanks for listening.