The problem is as follows: There are database torrents that expand overtime and get an update once in a while. However, in this particular case the old items remain the same and are unchanged. The usual procedure is that in order to use the new torrent you have to force a re-check or painfully deselect old items. Therefore, I suggest a feature that would presume that existing items with the same size are OK and skip their checks. This would allow to immediately use the updated torrent and reduce wear on the harddrive.