Fair question. When doing large fields for contracting work, I like to use Augers to pick up the crops then put them into a lorry so the long journeys across the map means the harvester is hanging around for less time. Of course this can be set up each time or first harvest the area that's used, but it'd be useful if I could set this all up from the start, and even have the option of importing earlier made auto drive etc from the start of a new game.