I m from Poland and in 3months will collect my new daytona grey RS3

We don't really have a forum about RS3 in here..
I saw that RS246 is quite Profi, so that's why I joined it

Hope you don't mind...
My question is:
What options does the standard "S Button" contain?
- Throttle response
- Exhaust sound
Does it change the suspension characteristics?
I m asking because our roads are quite terrible and I don't know if a 19-inch wheel is a good choice

Kind regards,
Nicholas