Thanks again for the explanation psychoadept, much appreciated!
What features are you thinking it still needs from the Navigator, other than being able to close the folders? [Edit: Oh, and I see the context menu is stripped way down, too.]
As for Playlists & Playlist Manager, I would hope for something along these lines:
bug - discrepancy w Navigator Playlist node - on-disc structure should be respected, i.e. folders, no matter the nesting level, should be displayed as folders, and are expand- & collapse-able throughout.
bug/feature - context menu seemed odd that it's different between Navigator Playlists & Playlist Manager - but I've used the contexts too little as I am yet to 'work' with it properly, I'm still in a testing phase, so I don't really have an opinion, other than that it seemed odd.
feature - lock playlists - i.e. I need to rely on it's absolute un-editability of playlists as many are a snapshot of a past radio show or DJ set, which I do not ever want to alter (minus, IF a track happens to move / rename / etc, for which one should be easily able to remove the lock, alter/fix, then lock again)
feature - allow Playlists to come from Monitored Folders - plus an easy workflow to push changes from internal .mdb files to m3u files (to be used elsewhere)
bug - MB playlist persistency -> http://getmusicbee.com/forum/index.php?topic=17942.0
feature - replicate playlist structure in exported iTunes Library.xml - i.e. folders - atm the playlists are flattened / the folder hierarchy they live in is not respected -> http://getmusicbee.com/forum/index.php?topic=15165.msg90562#msg90562
bug - iTunes Library.xml should be UTF-8 (Without BOM) encoded, as is, MB's exported xml is encoded as UTF-8 With BOM - which is fine for most programs (Serato & Rekordbox I have tested...), but one of my target programs (Traktor Scratch / Pro 2) takes offense to that encoding, so I have to manually alter that. Also, might be there's the opposite case... but iTunes native export is TF-8 Wihtouh BOM apparently.
All just suggestions from my point of view obviously