Hmmm, I think that I may be the somebody though I don't recall being asked this specific topic, and I do answer emails.
I seem to recall part of this conversation, based on the Castle ESC and my emails to Castle. Using the Demo mode of the Castle, for control line and high governor, the optional desired head speed boxes will give a head speed/rpm corresponding to a given pulse width. While the Head speed is not set in governor high, the rpm for a given pulse width is displayed. That pulse width can be for timers allowing that method, and the rpm will be quite close. A given rpm will also be noted to be too fast for governing or on the other end too slow for proper governing. The best set RPM range for the ESC, according to my correspondence, is in the governing range as shown by the program. If the timer system is active, the rpm may go above that range if the set rpm is close to limit. Castle stated that when out of range, the ESC would "attempt to run at the speed it is being told to, and if not possible, it would run at the closest range." It was not entirely clear that for a brief bump up or down out of range, how much "governing" matters, as opposed to having the set rpm in range.
Playing with the demo mode and varying the KV didn't change the rpm to pulse width, but did change the governing range.
My take was that one could pick a prop to stay in the governed rpm range and that meant a slight tweak of pitch, seemingly possible with the custom self made prop.
This "somebody" hopefully doesn't fall in in the idiot category, and clearly not in genius
That discussion of Demo mode on the Castle ESC started here in reply 5
http://stunthanger.com/smf/gettin-all-amp'ed-up!/another-dog-another-'tric-fiorotti-v4-4-timer-with-accelerometer/msg482345/#new