I saw in the roadmap adding Mining and harvest systems.
May you could think up in gather resources to craft parts or even better unique improves to shields, or damage output.
Also i saw Stations could be added... WELL! Player can have ships. So they must be able to construct their own stations too.
Other thing i can think in Factions system besides the pirates the player could join a major faction like the empire earning is credits by being a trader, personnel transport, combat vessel or if the player wish fight by side of the rebels to destroy the empire. While that things happens, a new faction of aliens swear to purge the humanity from the entire galaxy. Which also the player can join by being a Alien.