Actually, if you’ve got all other links in the menu structure, then the only non-link is the current page you’re on. It’s the same amount of CSS, or maybe less, that way.
Also, one could consider it more "semantically correct" to
not put a link that takes you right back to the exact page you’re already on in a navigation menu, too. I think Jakob Nielsen is a big proponent of that actually.
As far as adding another level of flyouts, I gotta think on that one for a second or two ... but I suspect the CSS could be the same amount if anything else is needed at all.