I've been using the program for a week or two now and find that it's exactly what I've been needing, so a big THANKS!
The one thing I haven't been able to accomplish (easily), though, is the creation and maintenance of iTunes-style 'Smart Playlists'. So far I'm doing this by hand: I set various Filter expression to select the files that I want and then generate a playlist for each one. This works OK, but I'd like to automate as much of this as possible. Ideally it would all happen unattended and completely autonomously. But any/all of the following would help. I suspect that some of them may be possible but so far my searches haven't turned up the answers:
Saving/importing my (rather complex) filter expressions. Right now I rely on finding them within the filter history.
Setting a default location for the playlist to be written rather than navigating to my dedicated output folder each time.
Perhaps what I'm really asking for is a 'Generate Playlist' action?