Hmmmm, I read your webpage on the subject. I'll have to disagree. It is only possible to ride a moped with the throttle all the way open all the time, you have to because they top out at 25-30mph. I have ridden for as long as two hours on my moped with the throttle in the same spot, and never once seized it. It is perfectly happy though to stay in any rev range for any period of time though.
Also, loop scavenging was prefered over reverse flow and finned piston designs because it was believed that it offered the least mingling of the fresh charge with the exhaust gasses, so unless you have extensively modified port timing, the amount of cool gasses actually traveling over the piston and out the exhaust port is very little (more so at idle, because of the bad scavenging characteristics of this port design at low engine speeds)