I added a suggestion to the uservoice forum here:
Use short press of camera button as push-to-talk-with-Cortana feature when not in camera app. – Feature Suggestions for Windows Phone
My suggestion is to use the camera button to automatically open Cortana and enable the microphone. This would effectively make the camera button a push-to-talk button allowing you to instantly talk to Cortana. This would not work when in a camera app, obviously, but it should work everywhere else, even the lock screen and with the screen off.
Would anybody else use this feature? If so, give it a vote or three.
Use short press of camera button as push-to-talk-with-Cortana feature when not in camera app. – Feature Suggestions for Windows Phone
My suggestion is to use the camera button to automatically open Cortana and enable the microphone. This would effectively make the camera button a push-to-talk button allowing you to instantly talk to Cortana. This would not work when in a camera app, obviously, but it should work everywhere else, even the lock screen and with the screen off.
Would anybody else use this feature? If so, give it a vote or three.