Currently, Emissive can only be specified within a SDR range, Emissive Intensity Factor would modulate the final emissive color after emissive tint with a range of [1.0, 10.0]

This would allow emissive surfaces to contribute HDR ranges to reflection probes like the sky does as well as be more heavily affected by autoexposure. Future shader improvements could hook into this intensity in the form of an autoglare.