In this case the scatter should be a base value and have something added as a shift, probably same for specular. In real life, men and women does that light effect on hair with strains lighter than some others, this type of effect I will model later and add specular contribution for the lighter strains… the effect would be even better if AO is adopted, but again, I think for the sake of cheap material have different materials set is better than a one material with tons of different applications, I mean, if the style is realistic, then one material for realistic, if the style is a little bit more stylized, then another material for that. This can change once material layers are released in the future, but I will not mess with this right now.