I wouldn't say that loading a saved configuration from a card is 'changing the mode'. Yes, the saved mode is loaded, along with all the other settings. That's been possible on several previous 1-series bodies.

There are many features that Canon *could* implement. This is one that, while nice to have, I haven't heard a real clamor for it. Contrast that with EC in M mode with Auto ISO, which has been a popular request for years, and which Canon finally delivered with the 1D X v2 firmware.