Sensus case adds pressure-sensitive rear and side touch pads to iPhone -- similar to PS Vita's rear touchpad.
Some possible uses:
- Use side touch pad to scroll web page instead of swiping on top of the display which obstructs the viewport.
- "Grab and pull" interaction that leverages thumb and index finger to to leverage front and rear input.
- Squeeze the phone to take photo instead of pressing physical button or tapping the screen which shakes the phone causing blurry shots.