In the beatmap select menu, being able to create a playlist where when you finish one song you can click "next" to take you to the next song instead of just "retry" or "replay" or going back to the beatmap select menu. Whilst in a song you can bring up the pause menu and it will have the option to "skip" the current song. All the scores from the songs would be considered separate still for leader board and ranking purposes, but in multiplayer there could be an overall playlist winner whether that be by total score or a points system where the winner of the current song gets "X" amount of points, 2nd place gets "X-1" amount of points and so on.