Yaroslav M. Blanter, 03/11/2012 12:22:
One of the technical problems is that wts shared does not show the file usage across the projects, so that we can not really even delete files which are dupes of the Commons files with a different name, because we are not sure about the usage.
Those seem two different issues. 1) Duplicates: if duplicate detection can't be fixed on wts end, it will show up when you upload duplicates to Commons (not too hard to track down). 2) Unused files: http://en.wikivoyage-old.org/w/index.php?title=Special:WantedFiles&limit... lists also files from shared repositories.
Nemo