One feature I couldn't find in any podcast client I've tried so far is the ability to combine upcoming feeds with an existing podcast archive in order to have a unique personal podcast library. For instance, Kasts can download episodes listed in given feed, and play episodes of that feed already stored in given folder. However for audio files I have in a separate folder which correspond to some old episodes of that feed which are not online anymore (or at least not in the XML feed Kasts can access), or even to some Podcast series that does not exist anymore but which I want to keep an archive of, I can't find a way to display them within Kasts. In other words, this feature request is about a way to add custom entries to Kasts' database.
PS: of course I could keep the externally archived files in a separate player's libary, but I am more looking for a unique place for podcasts (new & old).