Well, I would like to see a daily time travel mission where you need to go back and help one of your bridge officers. It would be a one-shot (if you fail, the mission is over for the day and you need to try again the next day) mission and the reward would be the ability to improve that bridge officer (e.g. if you start with a common ["white"] officer, the officer would be upgraded to an uncommon ["green"] officer, etc.).
Aong the same line, I would like to see a mission where we would be able to change our traits (with a day, week, or month cooldown).