Thank you for all the hints and comments and the encouragement.
If you had troubles importing due dates by the CSV import, there is a possibility now to choose the format of dates in the CSV. Check the content your CSV-file and select the appropriate date format in the import dialog.
Enjoy the release and have a good time :)
- configure font for finished activities
- CSV import/export - configure date format
- configure outline from within activity list
- expand/collapse all, show levels