For number 4. another way to control light within a building or cave or whatnot is to use a zone. There is a setting that controls it. Something like ambient.
Use a text editor that can search the whole project. I use one called Atom. Search for the filename. In the console, it seems to load with the PostFX manager?
You can use a text editor that allows a Find in Project search to cut down on the endless searching. I've been using one called Atom. Really helps a lot. I just open console.log then go to find in Project. Finds every instance.