I'm iwith you.
The Double Tap Xbox + Y or X is still slow and also puts up the annoying overlay. Rather have the ability to do one immediately.
This functionality is built into the new chat pad (a button for screenshots and record that), so I can really see it coming to the controller app.
It is not built into the chat pad. If you look at the product descriptions on store fronts, (amazon) you will see that they specifically note that this feature is coming "mid-2016".
I would agree that it is likely to come to the elite controller when that programmable button feature is released for the chat pad.