I would love it if we could repeat a Story Mission.
I don't want any experience, drops, or rewards for completing the misison. Sometimes they go to quickly because your are caught up in all the combat, and you don't focus on the Story. I just completed the mission "Ghost Ship", and realised after I finished it that it linked to the TNG Episode 'Times Arrow', featuring the Devidian aliens that drain Neural Energy (Ooops Spoiler!).
I would love to go back and have another good look around.