If I could pick one hardware feature that I'd love on all my i-devices and laptops, it'd be physical shut-off switches for the mic and camera(s). Or, in the camera's case, maybe a cover, since that way you're less likely to have the camera "turned on" without realizing it. [EDIT] and by "physical" I mean "actually breaks a circuit when off"
I haven't used it and have no connection to them but think they're onto something in their product design.