The introduction of Zeus has almost made the standard editor obsolete. Our gaming group has found that a mission that takes 10 minutes to make in Zeus is just as fun as a mission that takes 3 hours to code in editor.
Zeus also gets around any silly bugs or unexpected slip-ups in that the editor can fix the mission on the fly, or change the mission altogether.
However, there are times when a mission might span a few separate play sessions and we want basic things like enemy bases, enemy positions, respawns, loadouts, weather to be preserved.
If you could make a mission in Zeus, save it, and load it in at a later time, that would save a lot of time.
I know that you can create a zeus module within the editor and set up your bases that way, but this feature is very tacked on as the Zeus is unable to edit any objects unless they were placed in game. ie. the Zeus cannot edit editor objects.