[Plugin: Search Engine query in WordPress] Turn off box when not referred from search engine?

While browsing my site after installing your plugin (which works great, thanks!), I notice that it tries to produce results even when a search engine referral is not applicable. Is there a way to tell it to only produce results from the initial referral? Because it does slow things down just a tad, and might confuse surfers when it says “Your Search Results – no related posts” when they didn’t search for anything. Thanks!

http://wordpress.org/extend/plugins/search-engine-query-in-wordpress-related-contents/