Bongo should have commands for collapsing or expanding all sections in a playlist.  It would also be good to have a command that expanded all sections within a given nesting depth, but collapsed all more deeply nested sections (Daniel Jensen calls this a ‘top-level view’).

Actually, Daniel Jensen has already implemented the commands asked for in the previous paragraph and posted them to the mailing list.  (Romain Francoise even implemented them before there even was a mailing list.)  However, the ‘top-level view’ command is a kludge and should be generalized not to assume anything about the field hierarchy structure (artists, albums, and so on).  I take it upon myself to do this and merge the code into my Bongo repository RSN.