[jcsjcs]

1) The manual says nothing about rim sizes, only tires. I’ll take your answer as confirmation that the stock rims are fine for the recommended tires.
2) Since the only options I see for all seasons are the rear in 265, I’ll assume that winter speaks to anytime I plan to use non-summer tires which is most of the year as I plan to get a more track focused option for my “summer” option. So I am basically running a slightly narrower tire for most of my driving.
3) I do to plan to have fun and expect that will be the case on pretty much any tire I put on the car.