For fuel on the older motors of which most of mine are, I just add 3 oz. of castor per gallon to whatever fuel I have, unless it is clearly labelled to have 10% syth. and 10% castor. As for the 2.4 throttles, I was thinking of using the pistol type radio in my left hand and the handle in my right on some future project. I have seen some pics of the pistol type transmitters with the handle built in. I would think maybe with stunting a lot, that the throttle adjustment on the trigger could be bumped or sloppy? Not sure if wheelchair flying would be possible even, with both hands used up.