Leadership is actually a feat, not a skill, in the d20 System. Skills that could work well would be breaking Persuade down to what they are supposed to be: Bluff, Diplomacy, and Intimidate. Astrogate would be a fun/ If you fail your Astrogate roll you end up somewhere else, could severely damage the hyperdrive, or something like that. Also I think they should have timed events and using the rules for travel time in Hyperspace should have a huge factor. Balance, Tumble, Sleight of Hand would be good for a scoundrel.
Stuff that are basic in the Star Wars d20 game.