Its still not in the manual. The roam game is a SINGLE SCENARIO used by all of the casts. I currently play in the Assassin caste.
Yes the game is geared towards the military scenario, yes I know the Assassin caste is not covered with its own independent scenarios or missions.
When I can write my own scripts I will develop my own missions. Till that time I am learning to handle a ship, shuttles, the trading system, and trying not to get killed.
As to the story potential, I will choose to see the universe through the eyes of an assassin, and find fun and adventure where I can.