Automatic light adjustment
Since it has a built-in camera, use the EV to adjust how much light the camera throws out
On the front - High EV = Flashing / low light level, Low EV = High light level
On the back - High EV = Flashing (high), Low EV = Steady (match light level with EV)
This could be fully configurable or just have it as enable/disable. I'd just have it as enable/disable and leave it at that, for simplicitys sake.