Including subdirectories when importing folders

Hi,

Just had a situation occur with a friend who uses my equipment once in a while and found that as he sorts his music into different subdirectories when putting them on a USB, having to manually import tracks folder by folder can get cumbersome. There should be an option where as well as "Import Folder as Playlist", you should be able to select "Import Folder Including Subdirectories as Playlist" or something to that effect. That said, there should be an option to import to an existing playlist when this is selected instead of creating duplicate playlists.

I.e. Suppose there was an existing playlist called Techno. You select a folder called "Techno" that includes subdirectories such as "2015", "2016", and so on, and then you right-click on it and select "Import Folder Including Subdirectories as Playlist" and it prompts whether to import to an existing Playlist or create a new one. You select "Techno" from the existing options and tick "Do not include duplicates" and "Analyse on Import" and it imports all new tracks that aren't in the Techno playlist to it and starts analysing them in the background.

This way, he can take off from where he left off last time and also play around with the new tracks he's added this time after they've been analysed.