The guys at have made a video of an upcoming tweak for MobileSafari: FullScreen for Safari.

apparently it adds a FullScreen-mode and new gestures (2 finger swipes, shake, ...) with new actions (tab forward, tab back, ...) to Safari. The extension will be released soon.

Here is the vid:
[ame=]YouTube - FullScreen for Safari - Cydia tweak preview |[/ame]