You could, but basically they would do the same thing. If you held the reset too long, it would issue a shutdown. You could build a circuit to avoid that but its adding to the complexity.
Basically the button input is a single one and the board interprets a shutdown/reboot based on how long the button is pressed.
As clearly stated in the guide, the 10K resistor will simply put the board in LATCHING mode rather than MOMENTARY.
