After the Romulan captain encounters on ground have been added (thanks so much for that), I saw two new small issues in space. There is no NPC contact for Hirogen Battleship and Jem'Hadar Battleship. All other races have a complete NPC contact stock of Fighter (if there are any), Frigate, Cruiser / Escort / Science Vessel, Battleship and Dreadnought (if there are any).
Once again, like for the Romulan Captain encounters on ground ... I think it's gone forgotten by one of the devs to add them, so it's more a bug than a missing feature.