Get more out of calling in Gmail

The switching from Gmail to your phone thing looks really awesome. The only thing I don't understand is why they use they keypad for that (and for recording) instead of buttons.

For one, it's way easier to remember "click the button that says 'Transfer to Another Phone'" than to remember "click *". Also, I have no idea what would happen if one were to try to call an automated system that uses the keypad for navigation. "Press 4 to <do what you want>." "Ok, I guess I'm recording the call then. Until the next time I need to hit 4."