Apologies if you covered this in the readme.txt and I just didn't get it (and thanks for this plugin!).
I'm trying to add the Tags dropdown to my search results page--the same one that works in the widget--but I can't figure out what field I should be passing to facetious to call it. My best guess was "tag", but that doesn't seem to work.
Here's the code I'm using:
<?php do_action( 'facetious', array( 'submit' => 'Search', 'fields' => array( 's' => 'Keywords: ', 'm' => 'Month: ', 'category' => 'Category: ', 'tag' => 'Tags: ' ) ) ); ?>
The search results page I'm working on is here: http://thesockeye.org/search/money/