Well, you'd need to use my modified QuickTime Extras action. That reminds me, I should put up a tutorial for it on the knowledgebase.
Basically, you need to create a poster movie with a single frame by dragging a JPG to QuickTime player and saving out as a self-contained movie, then import this into Freeway. Apply QuickTime Extras, then expand the Link disclosure and enter the URL to your final movie.