Just using them as winter rims.. Off in 1 1/2 mths from nowI went with 16" ford oem aluminum wheels because my dealer said that ford recommended 16's to allow for proper cooling of the bigger brakes. Hopefully you don't have any warping issues with your rotors due to heat build up.
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Yes but if you look closer at the spare tire it has a sticker that says max 50mph/80kmh which might have more so do with speed ratings and or braking from higher speeds and more heat generated in those conditions.the full size spare on the FiST is 15" x 6.0" steel wheel with a 47.5 mm offset with a 185/60-15 tire.
Open 15's would probably be better than steelies, but I doubt you are going to be doing some track day type driving on winter roads so you'll likely be just fine.
I imagine the heat warning is for mountain passes (where you'd want to be on winters anyway). You can easily overheat brakes pushing it in the the mountains/foothills. Granted, you shouldn't see it when you're stuck behind an RV which is how it always seems to end up.I wouldn't worry about heat unless you are racing.
On the street, panic breaking is the only real test of the braking system and you never have to do it often enough to overheat the brakes.
The only heat related disk brake problem I've ever seen on the street was a 1967 Mustang GT with sticking pistons in the Kelsey Hayes calipers that made the pads drag.
