I’d love the ability to save a "material palette." Much like what we see in image editing software, photo editors, pixel art tools, etc., where you can have default color palettes like “Default,” “Palette 1,” “Palette 2,” and so on.
This would definitely be another quality-of-life feature — but a very welcome one.
I know it’s also possible to create a script for this purpose, but considering not everyone in the community may have programming knowledge, I believe this would be a fantastic addition.