Like Brucelee said, don't take anything personally, just take what's useful to you.
I live in the Hartford area. Considering the two places you frequent, you know exactly what happened to that central band of the state last winter.
I'd say as far as your corrosion concerns with the oil pan, it's not an unfounded concern, but the fresher your oil, the less contamination you'll have coming into Spring, right?
As for the suspension, why not try taking four more jack stands with some cushion on the resting points (rags, thick towels, etc.) and crank them up under the rotors so that they keep the suspension compressed without hurting anything.
Could find some cheap black steelies with crap tires, too. Matter of fact, I have 3 black steelies and my doughnut from the Corolla sitting at home (used one stocker for a full size spare). No idea if they'll fit the Boxster since they're 15s (I think the doughnut is a 16 or 17) and I know the Boxster's smallest OEMs were 16s, but I'll have to see if it's possible. If they do you're welcome to borrow them so the car can sit off of jack stands.