The brake roller computer works out the drag forward and backward and gives an average so front and rear prop never turns same with hand brake so dont worry about it my 04 l322 was tested like this for 5 years I had it and the 08 i have now just passed its test done that way with no issues.Hmm.
He said that 4x4 mode means one wheel is spun in one direction and the other wheel in the same axle is spun in the opposite direction.
He said that this prevents wind up.
I can’t quite get my noggin around the physics of it but I suppose if the rotation is equal but opposite the net rotation at the prop is zero ?
or is he just covering his arse ?