Perhaps you can assign an Anything Glows attribute to it. Not sure how you would tie that in to the SSS pattern, though. I'm looking right now at my desk lamp. Typical case, the translucent plastic diffusor has a hotspot near the bulb, and that's where most of the light for the my room is coming from. Obviously, though, that's not gonna happen with current implementation of SSS. Probably have to fake it with a shader in a glow channel, or something similar.