Sadly we don't have places where I've had the Ranger up to anywhere near those speeds to give any sort of helpful answer. Up to 50-60 it does still feel pretty well planted. At lower speeds it is a blast to drift through corners; like you said, smaller size leaves a little more margin for error.
Had several full size pick em ups, including a 2012 F150 Raptor, never the 2nd or 3rd gen Raptorized F150 though. For what it's worth, the whole package of the Ranger Raptor, even before the Ford tune, is just a blast in so many ways. I really appreciate not having the full size when I'm in...
It's been my experience that pickups in general, with even a hint of power, will have traction issues, especially if it's been raining all week. I am in the minority on this forum though, feeling that the Raptor has plenty of traction, if you drive it like, and expect it to act like, a truck...
If I wasn't so optimistic and positive, I would say that the update installed the problem it is claiming to fix as I had never seen a fault after an update before this one. Whatever, doesn't seem to be affecting anything else so I won't worry about it.
I got the warning Tuesday morning. The red brake light that illuminates when the parking brake is engaged stayed lit until I turned the truck off and back on again after driving about half a block. Was fine the rest of the drive but it's been sitting since.
I still think behind the rear seat back is the best for quick access, but sounds like not an option for you. This was in a previous vehicle, a Tundra. Had a piece of paracord across to both seat releases for the seat and could give it one pull to bring the seat back down.
Only thing I would note is a black mark from a plastic wheel chock or something that fell off a tow truck in front of us last year during a trip to Missouri. I never tried to get it off as I'm not opposed to the occasional battle scar. Wasn't enough to dent the plate though.