Command Line search engine setting

There's a site I wish to add in the search engine, but they do not use %20 as encoding for spaces, instead they add +. Example:

<!-- m --><a class="postlink" href="http://se.pricerunner.com/computing/storage/memory-cards/browse?&search=duo+4+gb&other_hits=200%3Amemory+stick+duo+4+gb_38%3B%3B%3B&q=memory+stick+duo+4+gb&ref=redirect">http://se.pricerunner.com/computing/sto ... f=redirect</a><!-- m -->