Change out the Left-Right-Both-Start switch to a separate starter and two toggles for the ignitions. You need to be able to crank the engine without ignition for maintenance and proper starting technique. These LRBS switches will cause kickback and damage to the spray clutch and ignition modules. When the contacts start to go bad, this can cause slow cranking, too.
A local guy wanted to do one of these competitions at his home-field as a EAA-Chapter event. I chose not to participate, as did many others, and it was finally cancelled, because I just didn't get a warm-fuzzy from the prospect of tight, low altitude, low airspeed maneuvering like this. One of the guys, who crashed the highlander, is a high time, experienced bush pilot with Reno STOL-Drag competition experience. The moose-hunter turn is a real danger to even the most experienced pilots.