I posted in a 3-month-old forum in hope Ch.G. would read all new posts and reply, but it didn't happen and nobody else probably reads all new posts. So, after a week, I decided to start the topic again

To resume, it was suggested there could be a new plugin type, a search plugin, to search by other criteria that those hard-wired. Examples could be mp3tag artist or a video duration. For details, see
http://www.ghisler.ch/board/viewtopic.php?t=1274&start=15
I noticed that a similar plugin could also be used to customize and extend checksum files beyond *.sfv and *.md5 to e.g. *.csv and *.tth just by using the same plugin and a format string.
The general plugin would extract any reasonable metadata from a file as either integer or a string. For a bit more detailed explanation, see
http://www.ghisler.ch/board/viewtopic.php?t=2781&start=6
or ask here. I know I can be a little cryptic at times

Milan