... continuing..
Allow the mission builder to edit the mission after the join time has expired. Today, when the 'join until' time has passed, you can no longer edit the mission and make waypoint changes, even though the mission is still active.
Ran into an interesting case, last night, where our bomber/escort mission had launched and been airborn for 30 mins or so, when our countrymen were capturing fields before we could get there. After the espiration time, we couldn't switch the waypoints to the next available target.
Yeah, I know I should have extended out the join until time, but that makes for confusion when having to choose between multiple missions. Invariably, if there is more than one mission posted, somebody chooses the wrong one.