My idea behind allowing to allow embed sfw is to allow people to directly show creations and examples. The way it would work is haveing a button wich allows, if wanted, to embe it (it's not called 'till the button is clicked). Obviously that SWF may not be saved in the server. But if it is not possible for security reasons there's no problem.
This button is usually used to hide big quantities of optional information (for example pictures of a creation or a change log). It's also usefull in tutorials or in really big posts.