I think you could plug it into "spec power" I remember someone earlier today talking about how gloss if for power and spec is for colour/intensity.
Autocon: I grade everything in terms of how many Skittles I award to each game. Like uncharted 2 got 184 Skittles. I also award and factor in things like color and taste of the Skittles too making it a very robust and diverse grading system.
Vig: I'll close with, "If you made art half as well as you bitch, we would all be rich."
Don't plug it directly, it'll look horrible. Use it as a Lerp alpha between your lowest gloss value (black) and the highest (white). I'd suggest something like 5 and 50, but really depends on your asset. Then just plug the Lerp output in SpecPower.