I think it would be brilliant to have crossfade as an option for individual playlists rather than just a global option.
This way you could have certain playlists mix together well and others just play normally. For example albums you don't really want to crossfade as they are mixed to a certain gap between songs but playlists you create might need it.
IDEA: CROSSFADE FOR INDIVIDUAL PLAYLISTS
HOW IT WORKS: SIMPLE OPTION TO TOGGLE CROSSFADE ON/OFF FOR INDIVIDUAL PLAYLISTS VIA RIGHT-CLICK OPTION