$EnablePageListProtect- When set to 1 (which is the default), causes 
(:pagelist:) and (:searchresults:) to exclude listing any pages for which the browser does not currently have read authorization.  Setting this to zero means that read-protected pages can appear in a listing, but can also speed up searches considerably (because page permissions do not need to be checked).
 $SearchPatterns- An array of page name patterns to be required or excluded from search and pagelist results.  In order to be included in a search listing or page listing, a page's name must not match any pattern that is delimited by exclamation points (!) and must match all other patterns.  See Cookbook:SearchPatterns.
# Limit all searches to Main group
$SearchPatterns['default'][] = '/^Main\\./';
# Exclude the Main group from search results
$SearchPatterns['default'][] = '!^Main\\.!';
# Exclude RecentChanges pages from search results
$SearchPatterns['default'][] = '!\\.(All)?RecentChanges$!';
# Prevent a page from listing itself in (:pagelist:) or (:searchresults:)
$SearchPatterns['default'][] = FmtPageName('!^$FullName$!', $pagename);
 $SearchBoxOpt- 
For example  $SearchBoxOpt ['target'] = '$DefaultGroup.Search'; 
 $EnablePageIndex- When set to 1, causes PmWiki to maintain a "link and word index" in 
$PageIndexFile which significantly speeds up categories, backlinks, and searches.
 $PageIndexFile- The location of the "page index" file for 
(:pagelist:), defaults to $WorkDir/.pageindex.
 $PageListCacheDir- The name of a writable directory where PmWiki can cache results of 
(:pagelist:) directives to speed up subsequent displays of the same list.  Default is empty, which disables the pagelist cache.
# Enable pagelist caching in work.d/
$PageListCacheDir = 'work.d/';
 $PageSearchForm- The page to be used to format search results for 
?action=search (unless the current page has a "searchresults" directive in it).  This variable can be an array, in which case the first page found from the array is used.
# Use Search page in current group if it exists, otherwise use Site.Search
$PageSearchForm = array('$Group.Search', '[=$[$SiteGroup/Search]=]');
 $FPLTemplatePageFmt- The pages to be searched for a pagelist template specified by a 
fmt=#xyz parameter.  Defaults to searching the current page, Site.LocalTemplates? and Site.PageListTemplates.
# PMWiki default setup
global $FPLTemplatePageFmt;
$FPLTemplatePageFmt = array(
    '{$FullName}', 
    '{$SiteGroup}.LocalTemplates', 
    '{$SiteGroup}.PageListTemplates');
 
It can be customized to look in other pages.
# Search a Group.Templates page as well as the Site templates
global $FPLTemplatePageFmt;
$FPLTemplatePageFmt = array(
    '{$Group}.Templates',
    '{$SiteGroup}.LocalTemplates',
    '{$SiteGroup}.PageListTemplates');
Or declare defaults for the template array:
# Search a Group.Templates page as well as the Site templates
global $FPLTemplatePageFmt;
SDV($FPLTemplatePageFmt, array('{$FullName}',
    '{$Group}.Templates',
    '{$SiteGroup}.LocalTemplates', '{$SiteGroup}.PageListTemplates')
   );