Yep, when you choose Sreen PDF, you're in. But you may also use somme other nice feature usually set in presentations : - you may use the Extra Tab to add transitions between slides (i.e. pages)
For more inof read : http://www.le-radar.com/?articles/scribus_ScribusPDFScreenEn.html or : http://docs.scribus.net/index.php?lang=en&page=pdfexport4 i don't see a Fullscreen feature : that would be nice ;)
