A couple of days ago we reviewed NativeER. Indeed there was another similar tweak released on that day offering very similar functionality called Decode Camera. The tweak is developed by ioshack (@ioshack).
Similary, Decode Camera has functionality to scan QR codes and DataMatrices. You can activate it in the Stock Camera app’s Option panel, either or both QR codes and DataMatrices. When it scans, a dialog will come up telling you that the result has been copied to clipboard directly. You can either close the dialog or open it immediately. This is what I love over NativeQR where you can only copy it by answering the dialog and head over to your browser or note to paste it somewhere.