the switch isn't an absolute necessity and is sometimes a source of problems with battery drainage. when that problem arises, it can be harmful to your receiver because it never really shuts off despite the switch being off. i know of several guys in the past, that never put a switch on their planes for this reason. they simply plugged in the wires between battery and receiver to fly and unplugged them to charge the battery,....i cannot remember any of them ever having a problem with pin damage.
if you mount the receiver in the wing seat area (under the wing) and use an extension or two, and put that connection in the hatch area of your plane, it is easily accessable after you put the wing on your plane for the day at the field.