Greg - thanks for the email pointing to this forum post, otherwise I'd have never seen it!
As Rich notes, the module hasn't really been designed to do that, but the functionality is easy to replicate.
A couple of thoughts, firstly http://doc.silverstripe.org/tutorial:site-map has similar (older) code as the module, so you could copy the two functions SiteMap() and makeList($pages) onto your Page_Controller and access them using $SiteMap on any page. Add in the css that the tutorial describes and you're mostly there.
If you're keen to have the Site Map Module working across the site, you can with a few changes.
Firstly, open sitemapmodule/code/SiteMapModule.php and on lines 118 and 160, replace
$this->
with
SiteMapModule::
Secondly, create a new function on Page_Controller as follows:
public function ShowSiteMapHere() {
Requirements::javascript("sitemapmodule/javascript/sitemap-default.js");
Requirements::css("sitemapmodule/css/sitemap-default.css");
return SiteMapModule::Content();
}
And from there you will be able to use $ShowSiteMapHere in your Page templates to show the site map. It won't affect your site map page at all, and you can swap the theme by changing the JS and CSS above to sitemap-slickmap.js and sitemap-slickmap.css respectively if you wanted.
If there's a lot of community interest we could incorporate it into the module, but truthfully, I can't image there would be!
Hope this helps :)
Design City