Cummins,
I know that this goes across the grain from what the car and buggy industry has imprinted in everybodys minds, but feel rest assured that the ABC engines used by the airplane and boat crowd have been broken in this way for the last 30 years. I know lots of guys running ABC type two strokes in planes with over 50 gallons through the engine.

What I'm saying above is run it, don't hammer the snot out of it, but don't let it sit and putt around either or do any prolonged ideling. For these ABC type engines to break in properly, they need a load put on them.
If you let these things sit and idle, super rich, with the wheels off the ground for break in, you just rapidly accelerated the wear on the piston and wore away a great deal of the pinch that makes the ABC type engine run. If you do it (break-in) the way an ABC type engine is supposed to be done (my way), and never run it too lean or too rich, you will have an engine that will far outlast (in gallons) one that is done the way the thread origonator suggests.

Do what I've done, take two identical engines in two identical cars (in this case Losi XXXNT's w/ stock Mach 15 engiens), and use the same fuel and glow plugs. Break them in on the same day, one is done in a similar fashon as the thread starter (car #1), the other one the ABC way (car #2).
Car #1 had the pinch nearly gone by the time the third tank was through. The engine ran good for about two gallons then it started to lose performance rapidly and became very erratic. Car #2 Was performing extremely well and was a two pull starter, with no hot start problems, it out performed car #1 every time and is still going strong with over 20 gallons through it. Car #1 was rebuilt using factory piston, rod and sleeve and then broken in the ABC way, it has about 15 gallons through it now ans still going strong. Keep in mind that my three boys are really hard on these cars and when they are playing with them, they will burn three or four quarts any time they get them out.

So, what is the rest of the list?