In terms of “lighting as a group”… There seems to be something in the engine that does that.
Although, as said, it does not what we are all looking for. So it must be something different.
However, I cannot find any decumentation about that feature. And the CTRL+ALT detail help is rather short 
So, although it probably related to something else, Im still curious…
What is the “light-*attachments-as-group” thing about?
I mean, I read the overal tooltip, but I dont really understand it :o