Where do I get to choose what files, maps and models I have?
You don't. And that's the point.
If I wanted to make all my models bright pink so they would easier for me to see everyone else while I'm playing or make all the textures see-through so I would know where everyone was, it wouldn't be very fair for everyone else playing online, now would it?
-- Tigger "It's not the years, it's the mileage" ~Indiana Jones