I had the thought of adding a seventh career option for Edge of the Empire: The Spy. I don't have a ton of details fleshed out, but this what I have for career skills (because they're easy, and define specializations well):
Spy: Deception, Negotiation, Outer Rim, Perception, Skulduggery, Stealth, Streetwise, Underworld
Con Artist: Charm, Cool, Deception, Skulduggery
Double Agent: Charm, Cool, Deception, Perception
Infiltrator: Computers, Perception, Skulduggery, Stealth
Informant: Negotiation, Outer Rim, Streetwise, Underworld
Investigator: Coercion, Perception, Streetwise, Underworld
Sabatuer: Computers, Mechanics, Athletics, Stealth
If you think this is a good idea (and worth continuing) I'll make talent trees, and try incorporating them into a game. I might even write a "sourcebook" for the spy, with new species, obligations, motivations, backgrounds, and adventure ideas...
...or just warn me to stop now.