I'm thinking about Auto cross too.
It has been so long since the last time that I Auto crossed that I have no idea what class it is in or what class it would be in if I modified it. From what I remember, once you modify it you have to run with the big boys.
My main desire is just to get to run it on a smooth closed course and spend some quality time learning how to drive it better. For me, the main limitations of the VT are speed limits, other drivers and poor roads. So an Auto cross course would be nothing but fun and finally a place where I can open it up without worrying about getting a ticket or wrecking it.
It will likely be in the same class as the GTI and Focus ST, so I don't expect to win the class. But that is not the point. It would be nice to be the fastest VT driver on the course.
Of all the cars I've owned and the couple I've Auto crossed in the past, the VT is by far the most "Auto cross ready" car I've owned yet.
I think a big part of the VT's charm is that it will be a blast on the Auto cross track without any modifications.