I've been toying with the notion of a dark side mini-campaign, with the PCs being Imperial agents that report directly to Lord Vader. Definitely be at Knight-level to start, and careers from AoR and EotE would be allowed. Probably something that I'd do pre-gens for.
That sounds cool.
It's actually based upon an old idea I had for a Sith Academy type of game set at some point between the Ruusan reformations (when Bane instituted the Rule of Two) and Episode 1 that never got off the ground. Core notion was that the PCs were angling to become the properly designated apprentice to a Sith Master as something of an experiment to see if having would-be apprentices compete against each other would lead to a stronger Sith Lord than the 'one-on-one' teaching method that Bane initially espoused and that the Jedi Order follows.