The current status of my thing is:
As it is a quite small sprite, I'm satisfied with one rotation point. The 'feeling' of the steering is quite nice. In combination with the acceleration and deceleration of the car-behaviour! And, I guess, that's where my problem is coming from: The vehicle drives on a narrow road with solids on both sides / walls. More narrow than the collision box of the vehicle itself. So, when it tries to turn 180 degrees around, the sprite jumps / teleports to the next free space it can fit. (I guess so) I think it's mentioned in the scirra-docs.
So, is there a way to bypass this reaction? That would be nice as my controling itself is alright.
Or do I have to forget about the car-behaviour totally and find another way.
Maybe you / someone can help me out.