I hope they implement it in future models in the next 10 years or so.....but I for one would never use it as it isn't part of my style technique of playing an arranger KB.
But I can see some may find it interesting. Korg has it now in their new releases, so I would wonder how many people will buy a PA3x using the CS feature a motivator to purchase..?

For me I'd rather see more of the great Ketron features implemented in Yamaha arrangers of the future like ...BASS LOCK, DRUM LOCK, Mic EFX off on stop,etc.

BIGGER Display screens on All Arrangers also.

Let's face it everyone wants Different features ...... and the more they put in the more you will put in out of your pocket.

Cheers to all manufaturers for what we already have now on the market....I'm happy!