The advantage of using the switch is to allow you to quickly and easily arm/disarm the power system after you have installed the battery(s) and assembled the plane (ready to fly). With the switch disconnected, install the battery(s) and connect the battery to the switch. When you are ready to fly, insert the plug to arm the system.

The ideal setup would be to mount the female part of the switch somewhere external on the fuse that is accessible (similar to the receiver switch for glow planes). This will require fabricating a mounting plate for the switch (or just let it hang out through a hole in the side of the fuse).

http://iflyrc.hypermart.net