well, when you add a new feed/filter, you could run it with the noSave option,
and then all torrents that would've been downloaded are not, and are
remembered as not to be downloaded.
Alternately, you could have rssdler save if to a safe location that won't be
picked up by other software, use a postDownloadFunction to check the date on
the rss feed entry, and move the file to an appropriate location if it the
date is satisfactory or delete the file if it is not.
--
lostnihilist