If no menu to disable, may not be in your version software. Probing through my old memory, and I believe there was a security feature you could enable.

You can always put a key switch between the button and the CFC board.

It Don't mean a thing if it aint got that swing.

Cool, Free, Johnny Smith courtesy of NPR..HERE
http://www.npr.org/ramfiles/asc/asc25.smith.asx