As far as briefing goes, there should be no need; it's not that hard. If a crew has to specifically brief how to run the radios in a CTAF, they shouldn't be there.
Agreed Capt, and that is exactly why such operators should have it included in their SOP's and I agree that differing volume's seems to work best. In a two crew op both pilots should get the same picture.
I am not offering comment on the accident as with my safety hat on, we really don't know enough at this time.