Darken and lighten Material maps

It would be great to add a feature that allows both lightening and darkening of maps. This would offer more flexibility when fine-tuning textures. For instance, if the texture slider is set to 0 in the center, with -100% on the left and +100% on the right, moving the slider to the left would darken the texture, while moving it to the right would lighten it. We’d also keep the invert option, as it would continue to add extra flexibility for adjustments. See image