As the title says... it would be very useful when one could remove duplicate files from a playlist. I believe this option wouldn't require to much effort on the developer's side.

Another thing about playlists that would also come in handy is the ability to add items (e.g. by a search form) while viewing
the playlist in the background.

Just a note... Foobar2000 for Windows is one of my favourite applications ever and discovering the Android version (the other day) made me really happy
Thanks for the great work guys!