Mig sayeth -
"Another suggestion ... is to build a side car. Now that would be a great idea, not just for carrying kids, but for transporting dogs. A Moped Army member in Kzoo was thinking about something like this for her dog, Taxi. A side car would probably be much safer and would be very hip, too."
And my response on that, is that if you would very much like a sidecar, I could probably build one for most 'peds...given some time and the right materials.
Remind me about it over memorial day, and we'll see what can be done.