lol you can shift yourself. There is a manual mode for some auto cars, like the vivace and k-series, just assign bindings to shift.
I think he doesn't know there's a realistic gearbox behavior, because if he knows, he can do it very easy --- Post updated --- Btw, there are default bindings for the shiftup and shiftdown, so he doesn't need to assign the bindings of them
Yes, that's the expected behavior, the S mode is a more sporty version of D. If you want to shift manually, go into M.