Thanks guys. That's exactly what I am looking for. I did a 55 miler this Saturday past and was trying to follow the cue sheet. It's a lot easier when the computer mileage jibbes with the cue sheet. Also like you, when I ride 100 miles, I want to see 100 miles on the computer.
Short of moving the button to the underside of the brake hood, (Might be a good suggestion to give to Shimano), I will try the O-ring thing too. Thanks John00. Greatly appreciated. I will keep you posted.