BB.
Sound advice! There doesn't exist any time or money in the current training prog to teach CC how to use the radio but (with a little shove during the refresher course this year) I'm sure it could become a popular exercise on night sectors to teach CC how to work the basics.
The Helios incident. Do I recall that the CC guy in the flightdeck had some flying experience? Any indication that he tried to use the radios?