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I just played with this using the placeholder and it does exactly what is being asked for in collections and setlists. It also looks like you can add an audio file to the dummy file without having a pdf/jpg.

Collections>make new collection [tentative list]>select new collection>placeholder [overflow] >enter tentative new song>long press new song>edit, metadata/audio. The new list entries start/repeat at '>placeholder [overflow] >enter tentative new song'. which seems about as quick as possible. The editing comes later.