1 - Trade section
2 - BO and main gunners mut be 120 only,rest have to be 115.Also don't use torpers on BB5,or 6.That's not about what you can do or should do,it's about what you absolutely must not do.
3 - Yes you need a 115 scout,and yes other pilots can go there too.About the latter,read what I said in 2.