Thank you for positive feedback ( :
@Thorsten,
At the moment it is not possible to rename a mission or to subdivide missions. You can plan a single mission in the map view and save it as e.g. “Project 00000”. We are already considering the possibility of renaming missions and multiple missions.
We have answered your question about the app crash on [Pix4Dcapture iOS 2.2.0] Feedback and experience community post.