Add an option to toggle tracking for a mission by right clicking on it in the mission log, which adds the objective to the side of the interface. Pretty standard MMO feature, looks something like this:
This would make grinding missions a little easier and more satisfying without having to open the mission window constantly.
Also: currently, when you have multiple missions, opening the mission log selects the first mission in the list every time. I think it'd be more convenient if it saved the mission you had selected the last time you opened the menu, and tried to select that one again.