Hey bro, thanks, I'm happy to help and I appreciate the feedback.
I haven't tested it on an Xbox controller, so I can't say for sure, but following basic mapping logic, it should be something like this.
Input.gamepadMapper = {
0: "ok", // A
1: "cancel", // B
2: "shift", // X
3: "menu", // Y
4: "pageup", // LB
5: "pagedown", // RB
12: "up", // D-pad up
13: "down", // D-pad down
14: "left", // D-pad left
15: "right" // D-pad right
};