Target Mode

When you double click on a playlist, it gets a little target symbol. After that, any song you double click on will go into that playlist. This helps people who don't want to deal with drag and drop. For example, a singer "signs in" by double clicking their name (this sets their "Tonight" list as the target), (or just double click the playlist you want to append to) then they proceed to double click songs from the library, or any playlist. Then they "sign out" by double clicking the targeted playlist again to un-set target mode.