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Thanks

I hadn't actually thought about the Mac touch-pad and unfortunately I don't have easy access to one for testing.

Is there anything built-in that can be use to restrict the area an item can be dragged?

Not presently. However, it's been on my mind for a while and as of now is priority numero uno.

Interesting, but neither the rotation nor pinch-to-zoom worked on my mac.

Show HN: interact.js – Powerful, flexible drag and drop and multi-touch gestures