The vision for Link Viewer is to provide a robust viewer app for your PDF prototypes. Link Viewer is thought to be a fool-proof experience where you cannot "break" the prototype.
We hesitate to implement gestures into Link Viewer because they might be triggered without intention. Menus might pop up and irritate the user, the next slide might show up by accident. "What did I just do?"... you get the idea. That's the reason why you can only navigate via hyperlinks in Link Viewer and why no gestures are supported right now.
At some point in the future some gestures might find their way into Link Viewer but for the moment we believe the "cons" outweigh the "pros". What do you think? Join the discussion.