Note 26: With Delphi 2005, in these dialog boxes you could edit the symbol name, but the code editor will only partially comply with your request. The symbol editing capability was later removed.
This note (at page 51 of the book) refers to the Declare Variable and Declare Field refactorings, and the corresponding dialog boxes. This blog post is part of my "113 Delphi 2007 Handbook Notes" blogging project, to promote my new Delphi book.