Is there any way to control emissive power besides GrassHopper?

There is a color picker for a material’s emissive color, but no way to control how strong the emission itself is, which is very limiting. I’m guessing there’s a way to do this in GrassHopper, but I was wondering if there will be a UI element in material properties for faster editing of emissive power.

There is no emissive power for rhino material definition, and I’m not sure if there’ll be one. @andy, what do you think? Something worth adding?