How about a feature where you could create a queue of tracks for each deck. Then have a big button for each deck that when clicked would load the next track in the queue onto the deck.

Or maybe even have a mode that you could activate so that when the needle moves to the beginning of the record again the next track in the queue is automatically loaded up. This would be great for situations where you only want to use a snippet of a track or for battling where record swapping needs to happen very quickly.