[Pywikipedia-l] replace.py - how to narrow down the results?

I am running replace.py and have several questions. Any help on any of the questions would be appreciated.

* Can I replace only the first result per page? * Can I exclude hits within a wikilink, url or header? E.g. can I look for appropriate technology but ensure it's not inside a wikilink, e.g. * [[Peter's appropriate technology lamp]] or * [[Wikipedia:Appropriate technology|appropriate technology stuff at Wikipedia]]) or * http://forum.permaculture.org (if I'm looking for "permaculture"). * == Permaculture program ==

Thanks - and thanks also to Merlijn van Deen for answering my last question.