So here is a small video that shows the side-issue with ideal manual pit stop.
As I've written already: The car drives in, turns back, gets correctly positioned and the pit stop is active. That may cost the player a tenth second or so.
If you had hoped about driving manually out of the box ... I'm afraid I must disappoint you as it is, as well as the pit stop itself, a sequence I am unable to edit (because I don't know where and what file is responsible for that).
To avoid this ugly flipping issue one would not be able to drive into the marked zone but only in front of it.
So again, it's about you and your
feedback. I'm personally not satisfied with either of the options, to be honest.