Changing the sorting options on my CDJ 900's.

I have started mixing in key recently and would like to know how to sort my tracks in my playlists that way. I Use a usb hard drive with my cdj 900's and link them up with a lan hub. When i enter a playlist on the players and press MENU the order is DATE ADDED, DEFAULT, ARTIST, ALBUM, BPM, RATING & ALPHABET. None of them are any use to me. I would like to find out how to get the KEY sorting option into them so that my tracks will be sorted that way. Is it possible? And if so how to I get it changed in the players?