A dry run command line option to help the user determine the potential of a cleanup. How many malformed tasks? How many duplicate file names?
This would work on scripts that make modifications, as well as on reporting. The key is to highlight savings. How much disk space? How many orphans?
Prioritize things that cannot be done in other tools. Go beyond simple counts.
Example:
A dry run would show the number of duplicate filenames, calculate the total file size saved, and provide a short summary.