I'm like many other previous and current scooter owners who have a background with only bicycles and scooters. I got alot of flack for mentioning this on a scooter forum from some folks with lots of history with bikes, but for folks who have grown up and have learned how to ride two wheel transportation from bicycles and scooters only, it is very, very unnatural to be stopping or slowing and/or holding oneself in place with only the right side of one's body, and I really, really miss two hand brakes. The rear brake pedal with the right foot has been one of the hardest things to get used to. I would stop on a hill and put both feet on the ground. On the scooter, I would hold myself in place with one or both brakes, and when the light turn green or it was clear, I would simply remove my right hand from the brake while holding the rear brake and roll out. But overcoming this habit on a bike has been tough. I would find myself sitting there with my right foot on the pavement and not being ready to move out. I would then realize that I've got to lift my right foot off the pavement and get it on the foot brake, because I couldn't hold myself with the front brake and roll on the throttle at the same time. This meant that I had to shift the weight of my body so that only my left foot was firmly on the pavement; then lift my right foot and put it on the rear brake; then release the front brake; and now I was ready to roll out, except that now the light was yellow again.
To long-time bikers this is no big deal, but if you're used two hand brakes since the time you were six, it is a lot different animal handling this element of a motorcycle.
I also miss and want dual hand brakes, but then I'd have to put a clutch somewhere. I'll just have to ride until it's second nature.