[pkscout]

Is it possible to have recursive scan option (or as standard) for "fallback slideshow folder"?

 I probably could, but I need to decide if I can make time to do the coding work.  AS only sets the folder that Kodi will display, and Kodi only shows images in the root of the designated folder.  So to do a recursive display I'd have to write something that copies all the files in every folder to another directory and then use that one.  That's actually what happens when you have multiple artists on a song.