No you can't change those fields. You could however create your own custom
dialog (userform) to gather the information that you require and save it
either as a document variable or a custom document property.
Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested. Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.
Hope this helps
Doug Robbins - Word MVP