I'm aware that you can reorganise your library in the OS file system, and then ask YAC Library to update - but that is sooo 1995.

I'm not a professional programmer, but it is really not difficult to implement drag and drop to allow organisation of the library inside YAC library - after all each item is already linked to a file, so if you want to mirror the file structure on disk as you drag an item to a different folder in the library you just need to do the same on disk (with some simple precautions for overwriting files or trying to move no longer existing files - but that's easy).

So why not implement drag&drop between folders in the library? It would make YAC library so much more convenient to use …