Not sure what the technical term is but it would be nice to be able to fade a loop at the end or beginning, just to take the sharpe edge off it.
Also if you could add dead space before or after the loop e.g. you have a nice 2 beat loop but you want it to cycle every bar I.e. first 2 beats is the loop, next 2 beats is silence, before repeat. I think you can do this in a remix deck by copying the loop segment but it would be handy if you could do it live in the track deck.