Really cool tool, I've been using it on our game and it made the workflow so much better and lets me do much more advanced stuff!
One complaint that I have tho is that I work in unity, and its default URP shader uses metallic/smoothness so I have to manually invert the metallic and roughness maps every time to use them. I think it would be very useful if you could add the ability to invert the exported textures in the export screen, maybe as "Metallicity Inverted", "Roughness Inverted", etc. drop down channel options.