(And, you need a TrailGator)
And, I must admit, the lack of brakes on Thing1's runbike has seemed to result in the fact that she will attempt to stop herself using her feet quite frequently. It tends to go brake-with-coaster then feet-off-for-final-stop-while-still-having-enough-motion-to-balance. The problem with this is if she's on a downhill, her motion will very rapidly increase as soon as she gets off the brakes.
Trying a few things. Increased use of handbrakes (brakes on a runbike could help instill this?). Also, using coaster brake until stopped completely, so instilling leaning the other way to put her foot down. She has her saddle up very high, so tippy-toes really can't stop much forward movement at all.
On the plus side, Thing2 is riding her runbike all the time now. Grabbing it for trips to the kitchen, as well as some more outdoor work. Won't rush it, but I think her first commute is imminent.