Sorry for delay, for some reason I didn't get the update.
Happy to add, but looking at the tooltips 'Visible for' might be better.
Also, given the space, should we change
Diffuse -> Diffuse Reflection &
Glossy -> Glossy Reflection
Also, if the changes to Diffuse & Glossy are ok, is the acceptable way to change the text within RNA settings or text additions to the col.prop()?