Someone has already asked this on the blog, but I had a few suggestions, because it is not as simple as assuming files stay disappeared.
eboostr should be made to remove deleted files from the memory cache every few days or does this all happen already?
If the deleted file is in a flash cache it should clean it only if the flash cache is full, but check way more slowly... every few weeks.
Maybe give non-disk-0 drives even less cache cleaning priority in case of mounted file-systems and removable disks.