RE: How to handle the guys with flawed plans?
Hanger 9 makes the P-51 MKII which is a standoff scale airplane that comes with leading edge devices and flaps set to a point where it slows the airplane down to be a trainer. The idea is that you can later remove the leading edge devices clean up the flaps and you now have a sport standoff P-51 to fly.
I've instructed a few students with that airplane, its OK as a trainer but IMO its not the best choice. Trying to do too much with one airplane. Its kind like recognizing that both a canoe and an ocean liner are each boats, but neither of them will do exactly what the other will effectively. Once all is said and done the MKII cleans up into a pretty nice little sport flier.