I would like to be able to set the starting iteration number

I have had a couple times where it would be nice to be able to set the "first" iteration number. One, where I was setting up a team that had been doing iterations for two years, and I wanted an easy way to make project look like what they were used to. Another was when we needed to set up a second project within the same company-- basically forking the development. We needed separate tracker projects and priorities, but it would be nice to keep the numbering in sync. I know the trick of "back-dating" a story (and have done that twice), but just having a number would be easier.