OK the instruction said connecting the black lead from magneto to engine body/ground, it will kill engine. I assume that in this circuit there are no current generated hence no spark from plug for combustion hence engine cut.

So if I were to set a manual switch, why kind of switch should use? Any switches will do like the RX pack switch that come with radio? or any particular rating that I must observe?

And if i have setup for a manual switch, can I also set up an additional servo assisted toggle switch for this? ie the black lead is going into a y adaptor: 1 for the manual switch and 1 for the servo assisted switch. Is this correct or is there other way?