Setup gpio 23 as shutdown & startup

Question

Followed this tutorial & have included my device tree config below. I've configured my pull up resistor for my button to function properly once my app is running, but I'm curious; is there a way to change which pins are configured to create a reset (on button press) rather than 5&6? I already have my connections soldered & would like to just reconfigure GPIO 23 (my button) to be able to shutdown/reboot. Is this possible? I'm new to electronics so the whole 'set high', 'set low' thing is new to me.

raspberry pi model B

raspian jessie

/dts-v1/;
/plugin/;

/ {
    compatible = "brcm,bcm2708";

    fragment@0 {
        target = <&gpio>;
        __overlay__ {
            pinctrl-names = "default";
            pinctrl-0 = <&my_pins>;

            my_pins: my_pins {
                brcm,pins = <23>;     /* gpio no. */
                brcm,function = <0>; /* 0:in, 1:out */
                brcm,pull = <2>;     /* 2:up 1:down 0:none */
            };
        };
    };
};