Space combat needs to be expanded in my opinion, but that doesn't mean they can't leave the current missions the way they are and just add other missions that offer more freedom.
I'd love to have some open space pvp zones where we would have more control over flying how and where we want to. Along with that having ability to earn ship upgrades through looting npc ships or pvp rewards or best of all some type of RE system would give people room to develop their ship and improve.
I don't think it has too be too complicated, but I would like to see more freedom and more choices in the type of space combat, the types of ships and ship equipment that is available in the game. I don't feel it should be a requirement to participate, but having the option would be great.
The more depth the better, but I'd take anything I could get to improve space combat, as it would add to the variety of things to do in game immensely.