i think somewhere i read most 2 channel radios have a 3rd channel or somtimetimes 4 built in all you have to do is find where it is on the board..i did this with my 4ch air tx and found the 5th....but yea...kill switch...a must...get a small valve that can be manually open and shut and hook it up to ure throttle servo so when u apply the brakes FULLY it shuts the valve thats connected to ure fuel line from the tank to the carb....therefore..no fuel ..no go...
ill have to do some searchin on where i found that article on hidden channels...