Check page 239 of the advanced edit manual...it does list the CS, but at the top of the page says NO Function Assigned....maybe it can be, but you still need to hit two at once??? I never got it to work on mine, but I didn't really try to hard to map it either.....

Maybe Don or someone who has an EC5 could try it..You would need the EC5 as you would need TWO pedal switches to do it...From memory I think I tried it with my EC5 and it didn't work, or not very successfully....

And page 10 of the main manual makes no mention of it being assignable either....