The folder checklist is a pretty helpful tool to keep track of work to be done. However, as far as I can see this information is stored only in .mapivi/dirProperties file. On the other hand I can recreate the entire Mapivi-database as soon as I've access to the image dirs as all keywords are stored in the images (which would in case even recreate my controled vocabulary). This is a great feature for crash recovery. Unfortunatley, the pretty helpful information regarding folder status has to be recreated manually, which might take some hours on a larger collection.
Therefore, I'd suggest to store the folder status also within the folder itself, may be in a hidden or within a hidden subdir. Changing the status can then update both dirProperties for caching and the hidden file. Upon a necessary database recovery Mapivi could read in those files and recreate dirProperties accordingly.