Just a crazy thought, but I wouldn't try changing ANYTHING while riding...mirrors...highway pegs...radio, etc. In my mind it's just TOO DANGEROUS!
Reminds me of a story a few years ago. Was out on the red bike killing some miles going nowhere in particular some afternoon. Pulled in to the dealership in Springfield, MO or Ft. Smith, AR or somewhere around here (just don't remember where for sure). Some guy was incredibly proud of just getting his brand new Ultra. I don't mean proud; I mean very very very proud. Real danger of popping buttons.
This guy wanted to go for a ride with someone. Anyone. Anywhere. He just wanted to have his bike on the road with another bike. No one but the staff was around the dealership. So I told him "let's go." And off we went to wind out some miles and let him enjoy his new bike.
The red bike then had some pouches on the glove box doors that would hold CDs and other things. The guy and I had been out for 45 minutes or so. In my mirrors he'd seemed a happy camper the entire team. I needed to change music. About this same time he wanted to lead for a bit so around me he went.
It was easy to change CDs with the discs accessible in those pouches. Pull the CD out of the radio, put it in your mouth, open the flap on the pouch, grab the new disc, put it in the radio, then take the CD out of your mouth and put it back in the pouch. Actually easier than adjusting the lower fairing vents while going down the road.
So I'm changing CDs and in the middle of this process the guy now leading pulls over to the side of the road. I pull up behind him to see what's going on. He sees me with a CD sticking between my lips and just chuckles. He'd pulled over because he didn't want to take his hands off the bars long enough to turn on the cruise control switch...
