Experimenting with graphics for my game and I realized I don’t want any specular or roughness, and I assume disabling that would also give me some performance gains (always a plus) I see under show > Lighting components > Specular. I can turn it off there, but I don’t think that’s a permanent solution, right? Id prefer not to have to do it by material or material instance as well.
Make sure all the materials you use plug a constant value of 0 into “metallic” and into “specular” and a constant value of 1 into “roughness”
I’ve not run into anything that can work across the engine… you may be stuck with a material based solution. Check the ‘Fully Rough’ Details options for the fastest shader that skips specular calcs. You can probably change the default for this but may take source code changes.