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Do you mean multi-touch scrolling or simply a scroll 'area' on the side? Im pretty sure all models have the area on them these days.
Have you ever tried two-finger scrolling? It's much more convenient IMO because you can do it anywhere on trackpad without having to look down to find a small area of the trackpad to use for scrolling.Yeah, scrolling on the side with just one finger. Don't need multi-touch or anything like that.