No, that's not quite what I said, at least it's not now I meant it to be taken. What I meant was have a separate lead coming out of the EI brick that goes to a built-in cutoff that can interface with the receiver. Guess I should have specified SEPARATE. i.e. one lead goes to the ignition battery, another one, properly isolated (if possible) within the EI circuitry that plugs into an active channel on the receiver that can be assigned a toggle swith on the Tx. Flip the toggle, kills the ignition.

This is not something, that I'm aware of, that is available today, and certainly not something that I would suggest someone tinker with. I would have thought that some EI manufacturer would have come up with something like this. Maybe it's not possible I'm not an electronic engineer. As I said, just brainstorming. Maybe give someone an idea that would make the modelers' life easier.