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@lemonzer - I use just Active. Hell, I didn't even know they added that one in there for global sites lists until you made me look it up.
I guess that second option is a way for the user to avoid going into each project to uncheck all search engines - to save time. So I guess if you were flipping around between search engines and sitelists that would be a timesaver.
I would probably just stick with the regular Active. Nice catch by the way.