Quote "The Rotax is designed to only start at idle. "
That is complete rubbish, I have seen one start at full throttle and heard about another (which wrote off a brand new flexwing aircraft and nearly destroyed a portacabin).
The carb fitted to the 912 engines is designed so that "the choke only works when the throttle is set to idle". If the engine is warm and the float chambers are full it will start at any throttle setting. It always surprises me how long the engine stays "warm" for. I find that it happily starts without choke for several hours after stopping. Very rarely use the choke more than once on any day.
Rans6.....