I have no "actual" winter Crossfire driving experience (since my XF is stored during those months). But I have owned a few other cars in the past that had nearly identical demensions, weight, and weight distribution as the Crossfire, that I did drive thru a couple Ohio winters.
If you use taller, more narrow tires, with an aggressive tread on the front and back, and add an extra 100lbs of ballast in the trunk, it should help out a lot in deeper snow situations. On ice, it should react about the same as any other car. Terrible.
If I had to drive mine in the winter, I would pick up a set of 17" Mercedes wheels from a salvage yard like LKQ, and probably go with 55 or 60 series Blizzacks.
I've read where people have said that the traction control is useless in some situations, where as others have had better results. Even when you turn the TC off, it's not completely off.
Good Luck