I had an idea.
Would anyone be interested in a multi-person mission in a Delta-IV?
It would work like this. There are many parts of missions, such as launch and docking or EVA, we can assume a 'player' does different parts. The game allows for people to be renamed i believe, as such we can use our crew of 3 or 4 to do some mission.
This would require practice by me at least, Orbiter is very complex in some parts. The goal would be simply to survive and complete a mission. At the beginning I'd suggest a Orbital EVA/dock with ISS/landing. Maybe later a moon landing! or further.
Once your part is completed (EVA to recover something or simulated repairs for example.) send the save to the next part of the mission.