Hi,
I think this might be a popular idea; how about the ability to control the amount of visibility a light has to the camera? We can currently have the light either visible or not, but why not have it 50% visible (that is, the actual light intensity is still 100% of whatever it's value is, but the light sources visibility to the camera is user-defined).
I think a lot of people currently use a 'double light trick' in scenes, one light invisible to the camera that is very bright, and another light that is visible to camera but much smaller for light bloom/glare and realism. This new requested feature might eliminate this workflow :)
Food for thought. Thanks!