Hi,
Here is an update version of the plugin that probably meets your needs.
This version requires DokuWiki 2009-12-25.
No Highlight Plugin for DokuWiki
http://github.com/kazmiya/dokuwiki-plugin-nohighlight/zipball/master
* Removing "?s[]=term" from search result link URLs has been implemented.
The search term highlighting feature in wiki pages is still available
if your browser sends HTTP_REFERER properly.
* Admins can set site-wide settings via configuration manager plugin.
* Users can select either "Disable all highlighting" or "Use site-wide
default settings" by adding URL parameter "?nohighlight=[1|0]".
This per-user setting is persistent since it is stored in user session.
For example, if you don't want to have extended url in search result and
want to have term highlighting in wiki pages jumped from the search result,
settings below will work.
$conf['plugin']['nohighlight']['disable_highlight'] = 'none';
$conf['plugin']['nohighlight']['remove_url_params'] = 1;
Hope you like it.