Outwest,
I do see your frustration of different procedures but in my lifetime, I've heard of nearly 10 x FCU/pilot related issues in PT6T helicopters (FCU to Manual Mode usually) and only one hot start in a PT6A (related to a Fast Start system on a 802 and an inattentive pilot). Bottom line is the fire isn't going to start unless the ignitors are on. This system works just fine and encourages a larger safety margin for your average fixed wing spray pilot. If there was a Manual Mode on PT6A's, Air Tractor would never encourage pilots to move a switch just a few inches from the Manual Mode switch (as Bell does).
For mine, the PT6A is far more likely to be hot started than suffer a flameout requiring an air start. Air Tractor has employed a procedure that gives the largest margin for error for the most likely scenario.
Best of luck getting an answer from Olney!