Can't see why, if the buttons can't be re-tasked to single pushes (admittedly, they already have a single push purpose, this is why Korg decided to go double button push, IMO), you can't have a single button CS implementation on the touch screen.

In fairness, as your LH is often tied up chording, having the CS buttons where the RH can get to them as well as the left is pretty optimal.

Is there a MIDI command to start and stop the CS, Dennis? You might be able to use a Behringer MIDI pedal or something like that if you can....