Mouse cursor moving off viewport and returning on the other side?

I distinctively remember Blender having this sort of a feature in the early 2.5 releases. Then at some point it just disappeared. I can’t find it in the add-ons or any settings. Was it removed or something? It was really useful.

You can see the feature in this video at the 5:35 mark: http://vimeo.com/18335506

File / User Preferences / Input, enable Continuous Grab. Note that it can be buggy.