Hi,
Since some people mentioned in the past that it would be nice to be able to edit patches, including the diff, I added the 'edit' command in today's snapshot (and StGIT repository).
The command moves the editing features from 'refresh' into a separate (and improved) command. In addition, it allows one to modify the diff directly with the '--diff' option. The command also parses the From: and Date: fields in the patch description so that the author and date information can be modified.
'stg help edit' displays more information.
Enjoy :-)
-- Catalin