I know this “problem” is a bit niche but I think it would pretty cool if you could customize the color scheme of the spectrogram feature (Blue/Green, Yellow/Red, etc.).
In what way would you want to customise it?
Is this just to make it look prettier, or would it improve usability in some way?
Sorry for such a late response, while color customization would be cool, I was mostly talking about added customization of different ways of plotting spectrograms being added to the spectrogram settings.
The next version of Audacity (3.0.3) has two new color schemes for track spectrograms. One new full color scheme, and an inverse grayscale scheme. The new default is shown in the first screenshot below: