Well I don't know about WF, but in WFA it was just a totally different game type, where as in TF it was a mere mapping option (could have normal CTF where it was just a single goal and you could have another goal where you got points for destorying e.g. enemy generators or something, both in the same game type).
Check tfentref.txt for a better idea what you can actually do. It's is just quake map entities on steroids, not different game types.