Hi there.
I suppose there is no way to do that… so may be it is a good idea for feature request…
In short:
I need a way to control amount of lighting that comming from ILCQ (indirect lighting cache quality) onto movable actor.
I know that now we can completely remove object from ILC cntribution. But I don`t want to do so… I have setup good and nice lighting for enviroment… and now I put my character on enviroment and character is overbrighted by ILC. So, I want to suppress a bit ammount of light from it… make it 5x smaller only for that character. But there is only option to turn it off completely 
So, if it possible - please, say me how?
if not - let it be a handy “feature request”…