I thought the people who stole the Death Star plans was already known (the guy in the first Dark Forces games...)?
Anyway, for the original SW RPG, West End Games put out several campaign styles books.
One on pirates (or privateers). One on running a tramp freighter. One on being a scout (like in finding new planets and exploring them). One on being special forces. One on being bounty hunters.
There was one when the PCs were the crew of a Corellian Corvette, chasing down a Moff. It ended up on a world with a kind of magic. (The Darkstryder campaign). It also had a world not unlike that of Flash Gordon, or at least the 30s serials.
I had a campaign where the PCs were mercenaries, fighter pilots primarily (sort of like Rogue Squadron, only more neutral). Also one where they were a spaceship rescue crew (like the Sector General series).
You can pretty much do anything in the Star Wars universe.