Agreed! Ableton Link would be pretty nice to have. Chords would be nice as well. For chords, you do have an alternative, but it will cost you some money: add a synthesizer and connect it through midi with the djs-1000. You can then programm your chords on the DJS-1000 and let them play over the synthesizer.
Update the DJS- 1000 Poly and Ableton Link
I recently bought this player and I feel to actually make music it definitely needs ability to play chords if your gonna have scales available. It only makes sense! plus its 2020 please add Ableton Link and Song mode! Us DJ's want a set we can load up and play. I'm sure you can do this because its basically what the MPC does.