We absolutely need ambient lighting in the Tech Room!
It's very annoying as it is right now - most of the time some ships are almost completely invisible due to lack of lighting. I'd appreciate a restrained level of ambient lighting in missions if possible, but this one is just a humble request. I agree with IceFire, you ought to be able to see and distinguish some level of detail even on the dark sides of large ships. It's just a matter of convenience; since this isn't a hard-core simulation we don't have the meters and instruments we would "in reality" have to fly in such environments, so right now we're half blind in those instances. Not that it's always a bad thing, but in this case it reduces the enjoyment, in my humble opinion.
So, I propose ambient light setting in FRED, and when there isn't one (like all old missions) it defaults to none or whatever has been set via command line. Then you couldn't override mission settings and everyone gets what they wanted, yes? (Just remember to add it to tech room at least.)