I think Korg made a major mistake choosing WHICH buttons to double-task... Using the Memory/Bass Inv/Man Bass buttons was a problem, as those are buttons you tend to use a LOT (or at least, some of us!) so Korg had no choice to make the double press needed.

Personally, if no extra buttons could be added (and why Korg didn't think this through is a problem) my choice would have been to use the Mode buttons. Re-task the Demo buttons (maybe simultaneously pressing STS Mode and Auto-Fill) then use pressing Style Play and Song Play simultaneously would change the Sequencer and Sound buttons into CS Rec and Start/Stop.

The trouble, of course, is that Korg have silk-screened the functions onto the case now, so our chance of getting a more logical layout is slim to none. So, I guess our only hope is a redesign of the touch screen layout. There's room at the bottom for a couple more tabs. Maybe far left CS Rec, far right CS Play/Stop (so you don't accidentally hit the wrong one).

Hey Korg... How about giving me a call before you design the NEXT PA with a CS? LOL