Sorry, what I mean is you can use 2 remix decks (C & D) and use (A & B) as your 2 Track decks. You'll still have to switch between them but it just as simple as
1. Hitting the shift button and knob above browse button to switch between the 2 remix decks
2. Hitting the shift button and browse button to switch to the 2 track decks (and back to the remix decks)
I tweaked their TSI file to control the play/pause and cues of track decks and few other minor things as well.