RE: Using switches on ESC's??
Agreed. Switches are a bad idea.
First off, it's another level of complexity in the system. Something else that can and will go wrong.
Second, switches add resistance to the circuit, waste power, and hurt performance. Even with LiPolys and brushless motors, we really don't have any to waste.
Third, it's a safety issue. It takes a concerted effort to plug a battery in. A switch can be easily bumped, arming the system with no control from the transmitter. Worse yet, if someone is flying on the same channel, you've just given them control of your plane, on the ground, in the pits. That guy cuts the throttle to do a hammerhead or something, then punches it to pull out... He's just armed your ESC and stared your motor! [X(]
Fourth, you can't just use a Radio Shack toggle... No sir, it needs to be designed to handle the Volts and Amps your system is drawing, and those kinds of switches are neither inexpensive nor light.