Once you manually shift the gears in "S" mode, it's goes to manual... And if you're asking, I'm pretty sure you have a lot more to learn and understand before you need to worry about rolling runs, lol... No offense intended, only suggesting
I'm old school though and never really understood rolls, but with the turbos, it's necessary (boost) and is less traumatic on the drivetrain. But then again, my history is 1/4 mile straights, with beastly large blocks NA, later some SC engines...
Anyways... Just leave it in "S" as the programming and shift points are more agressive than normal, and you'll never be able to "best" what the computer can do as far as optimal shift point (rpm) and timing... Enjoy!