Would it be possible to have the mission list have a filter that hides missions we've already completed?
There could be a check box somewhere on the UI that when checked, filters out all these missions. Whether it starts off checked or unchecked is up to Cryptic, but I'd prefer checked.
This helps both authors and players.
Players don't have to hunt for missions they haven't played before which helps authors get their new missions better exposure
I'm pretty sure that the game recognizes if a mission's been played already because the edit rating button shows up and the (Q) icon changes colour. Don't know if it can differentiate between "you've accepted this mission before" and "you've actually completed this mission". Still even if its "Filter Played Missions" instead of "Filter Completed Missions" it'll be a helpful nice feature.