One website that we are building uses the alphatoolbar plugin. One problem that we had was that the Tag function would conduct a search of the site using the "any" searchword option. Obviously some keywords returned thousands of results while we were looking for "exact" matches, so that it functioned more like a tag system.
To change the behavior of the tag button, open alphatoolbar.php and around line 142 change :
From:
$tags .= "<li><a href=\"" . JRoute::_("index.php?option=com_search&searchword=$metakey&submit=Search&searchphrase=any&ordering=newest") . "\"$tags .= "<li><a href=\"" . JRoute::_("index.php?option=com_search&searchword=$metakey&submit=Search&searchphrase=exact&ordering=newest") . "\"

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