Immediate playlists are very useful when playing songs at regular intervals from other playlists. However, I miss the option to play one song only in a fixed order within the playlist instead randomly, just as it can be set for rotation playlists. This currently only works with all songs in order.
The result of random playback is that some songs are played twice and three times, while others are almost not played at all, which is a bit annoying if you want to play new releases the same number of times. That would certainly and without much effort possible with a small update.