I got a (small) feature request: Currently if you add a texture to one of the material slots the color picker will be disabled (replaced by the texture of course). Now many game engines offer the option to blend a color value with a texture input, making it possible to make small adjustments to the final color output.
I'd love to see this behaviour for Sketchfab, too
Technically the shaders in Unity (for example) work like this: finalColor = inputColor * inputTexture.
Default values for both input color and texture are white. So if only either of them is used the calculation kind of just does nothing and you see just the texture / color that you want to use.
Of course it only makes sense for a couple of parameters, noone wants to color correct a normal map I'm pretty sure though that it would add some nice flexibility to the editor.
Hope you think about it