At the moment the turning commands are utterly useless as there's some massive delay (even without regard for the radio message) that makes it virtually impossible to do anything but make a vehicle spin around.

Something like:

unit CommandTurn direction

or an altSyntax for sendSimpleCommand
vehicle sendSimpleCommand ["TURN",direction];

as the current ways to get an AI driver to face a particular direction are varying levels of suck/broken. Usually involving commandMove in a direction

"VTMAbs, _dirWanted RadioMessageVAzimut"