I have to admit that I might be brainwashed by other very user friendy written software: Every user of portable audio player firmware replacement "Rockbox" or users of the Logitech "Squeezebox" with mediaserver know the "current playlist". This playlist is like a playback queue created by a selection in the library (or file browser). Later when music is playing, additional songs can be added to this playlist. The playlist can also be accessed easily from the playback screen and edited on-the-fly.
This great feature of the "current playlist" is what i miss with f2km. I also know that implementing this would require a mayor rewrite of the ui.
Anyway, thanks for reading and regards,
cholero (using iOS)