I think a good addition is to add the total playing time of a playlist from iTunes for example that is selected and shown in the library window/section. Currently I can see how many songs are in the playlist. To the right there’s a bit of empty space that you could add this. It would help gauge how much music you may need for a dinner or cocktail hour for example. It could also help you plan the last songs of the night to make sure you have time to pick the right songs and end on time as another example. I’d like to see this in the queue section as well.