I like this idea for at least two reasons:
1) the "Center" button already has a dual flip/flop function now in taxi mode, where you can toggle between airport diagram and map when in Ground Mode. So a flip/flop toggle function in flight mode would be similar functionality.
2) Assigning a flip/flop function to the "Center" button in Flight Mode would always keep the Center button alive. As it stands now, the button disappears and stuff jumps and and down (stuff like Sectional/TAC selector and Alert icon) when the Center button appears and disappears. (Would have to make it so that Animate RADAR always goes above Center button.)