Comment 3 for bug 898853

Yes, Unity grabs all three- and four-finger gestures. This is explicitly by design. They are designated by Unity as "window management" gestures, not available to applications. This is not a bug or a misfeature but intentional functionality.

The uTouch stack recognizes all multi-touch gestures of which the hardware is capable, so this bug does not apply to utouch-grail. It is rightly a design task.