I found some solution!
The saved single player missions have a cfg file "crew_config_*.cfg", which is the crew configuration (as it named) at the default saves (Dokuments/blabla/SingleMissions).
You can copy your campaign crew config file "crew_config_*.cfg" there and rename it to the saved single mission file. After you load the saved mission, the crew will be your own!
That's not the best solution, but something good.