suggestions

i want to suggest some options if they could be done in the software
1-removing duplicates in a playlist
2-finding a track's playlist when in a collection coz sometimes i have many playlists and cant find the playlist of this track.for example if i have a rock song in the collection i want the playlist that this track belongs to
3-is it possible to make the remaining and elapsed time of a track shown at the same in the playing decks
4-tracks are marked as played for just loading them into the decks,an option for resetting played tracks or a minimal time
1-removing duplicates in a playlist
2-finding a track's playlist when in a collection coz sometimes i have many playlists and cant find the playlist of this track.for example if i have a rock song in the collection i want the playlist that this track belongs to
3-is it possible to make the remaining and elapsed time of a track shown at the same in the playing decks
4-tracks are marked as played for just loading them into the decks,an option for resetting played tracks or a minimal time