Hi Rupert,
There's not a "one click" for this, but you can post existing revisions up
for review using post-review. See:
http://www.review-board.org/docs/manual/dev/users/tools/post-review/#posting-committed-code
I don't know if that plugin and Review Board could work together. I know it
doesn't
with much interest i found reviewboard. when starting newly reviewing
existing code would be a really great option. is there any guideline
to a "one click review my existing code" (or "one command") ?
i found one plugin into edgewall trac:
http://trac-hacks.org/wiki/PeerReviewPlugin/Screenshots,