Rekordbox DJ - filter or related tracks for songs with complimentary keys

Would be great if you could automatically filter tracks in playlists that have complimentary keys to make harmonic mixing easier.

It could be a dynamic filter, so for example if you're playing a song in A min, tracks in complementary keys (D min, E min and C maj) would be displayed. 

Alternatively this could be implemented using intelligent playlists or related tracks.