Offers a list of countries to search by. Best to offer a link via a menu option to get to this page. Set the url to something like http://www.domain.com/index.php?option=com_jomres&itemid=NN&task=funky_search_country.

 

Note, this feature uses the basic search settings from the integrated search feature, so you will need to enable searching by features in Site Config -> integrated search if you want to use this plugin.