I'm sure I'm beginning to get on Luc's/VStep's nerves here, but I haven't found myself reassured by any answers here. In order to prove this, I took the ferry for a spin at Bora Bora, docked with her port side alongside(which was, at best, difficult without stern thruster use), moored the ferry with a spring line, and put on full speed ahead and hard st'b rudder to bring her stern alongside.
Nothing happened, instead she swung her stern out from the quay with a speed of 1,2 knots.
To test the realisticness of her dynamics, I then applied hard port rudder without changing engine speed.
Surprisingly, this reduced her athwartship's speed to 1,0 knots. Is this realistic..?!
When this was done, she was docked stern against the quay.
On departure she was given hard port rudder, thereafter full speed ahead.
As the attached screenshot shows, at a SOG of 2,4 knots, she only has 0,3 knots speed athwartships.
As the SOG rises, her ROT increases and she eventually reach an athwartship speed of 4,8 knots at 8,1 knots forward.
This proves, in my view, that she is indeed configured to swing by her speed ahead, and not by the thrust made by her propellers. You may call it sailship-like dynamics, or, as I wrote further up this topic, that she behaves like a twin-screwed vessel with a single, centre-mounted rudder.
I do believe that a only a full revision of the ship's dynamics will do her justice.
Attached are some screenshots of my aforementioned points.