Single tap to show buttons. Double-tap to zoom in/out quickly.
Single tap to show buttons: It`s hard to be driving and have to double-tap on the screen to show the button bars. Can you add a single-tap option? Can you also add a double-tap zoom-in/out (like some browsers, such as Dolphin Browser have)? E;g.: double tap: shows buttons. Double tap while buttons are visible: zoom in to x%. Double-tap again: zoom out again.