Don't know if any iPhone 5 owners have seen this. But it looks like being a pretty handy little piece of kit
XiStera - 8 functions for iPhone 5 in the palm of your hand. by Joe Adams — Kickstarter

Full disclosure: I'm not affiliated with them or Kickstarter in any way, just had a friend tell me about it, took a look and ordered. Though I am a bit of a gadget and thingamy magpie