Hello Spoon,
is there a chance to see a dynamic playlist? It would select & play all songs in the library found by the search criteria like the dynamic browsing. Actually there exists dynamic playlists like 1960s, 1970s, ...
This could be something like: all titles with <<Genre like "Ballad" OR Genre like "Lo-Fi" OR Genre like "Downtempo" AND BPM < 120">> or even more complicated. The selection string should either be entered in an .M3U file or withing the application.
The custom title of these playlist should be displayed beneath other playlists.