So I have been asking around, well just emailing at this point, and got one reply.
At
http://www.colonrectal.org/contactus.cfmin St. Paul/ Minneapolis Minnesota, the lady said, "We are happy to evaluate people for narrowing in their anal area and determine appropriate treatment. However we do not routinely do anal dilatation."
SO I took that as a, yes we do do it sometimes.
I will keep looking/asking around about it.
-Tanya