Google Glass "ok glass" from Anywhere

The main voice commands on Google Glass are available only from the main timeline card. It would be great if you could activate the voice action menu from anywhere. The view would overlay whatever you are currently view. If you say the right keywords, it would present the voice action menu as normal. I propose a two finger swipe down on the touchpad to activate.

My homework:

- What other gestures are available to developers (potential to change gesture)?
- What impact would a "always listening" feature have on Glass if it were to always be waiting for the user to say the keywords when in use (eliminate a gesture altogether)?

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