I had a similar issue that Auto-Analyze did not show in the preferences. My problem was that when turning Pan and Zoom tool on, it automatically detected all the faces and lengthened the clip. I was told to turn Auto-analyze off, but then it was not anywhere in the menus. I found it at the Organizer and turned it off, but in the video editor it still showed.
I was advised to use keyframes for panning and zooming. Now I am happily doing that and don't care much for the panning and zooming anymore. Still, it would be interesting how to turn the Auto-analyzer off in the video editor itself also.