I know there has been some chatter around being able to explore you own ship more, and I am not sure if this has been suggested already, but it does seem some of the maps required to enable this already exist, engineering for example, as well as a bar area, and cargo bays.

I would be nice to have some repeatable mini-quests both onboboard using nps/bridge officers as well as planet side on platets we have completed in the episodes....