Ccollab admin review-xml limitation

Ref: Case #00177750 - ccollab admin review-xml can only list the current and previous version of a TFS Changeset even though the review contains several older versions of the Changeset.  This limitation reduces the usefulness of the API. In my case I simply needed to make sure if the review included the full list of changesets which was not possible.  Plase add this capability. This would enable me to complete my TFS Collaborator script which I can then share with the community. Thanks