Lumia 920 - No Exposure Lock / AE Lock Natively?

[pentaxis]

This seems like a bit of an oversight considering the camera is such a touted feature on the phone and this is a basic feature for being able to set exposure and recompose a frame. I know there are apps that allow you to do this, but it takes away the camera button launch function. Any ideas if this will be added as an update in the future?

 

[pentaxis]

Am i missing something or is this actually the case?