I would also certainly enjoy the possibility of playing single notes on the left side of the split, once the 3 notes for the chord have been pressed. It never existed on any Ketron product... except when I connected à Yamaha piano to an XD3! Through MIDI, I was able to play single "piano" notes after the 3 notes of the chord were played in. The Yamaha piano was split in 2 zones and it worked.
There are so many Fingering mode, why not give us another one where you could play single notes on the left.