Esplora: how could I program the slider switch to give Dpad 4 more functions?

Hardware Arduino Esplora
2

maybe define

const char keystrokes[2][] = {
KEY_UP_ARROW,
KEY_UP_ARROW,
KEY_DOWN_ARROW,
KEY_DOWN_ARROW,
'1',
'2',
'3',
'4',
KEY_UP_ARROW,
KEY_UP_ARROW,
KEY_DOWN_ARROW,
KEY_DOWN_ARROW,
'5',
'6',
'7',
'8'
};

and change line byte mode2 = map(slider, 0, 1023, 0, 13); to mode2 = map(slider, 0, 1023, 0, 1); (declare at top of loop byte mode2=0;)

then

if (newState == PRESSED) {
Keyboard.press(keystrokes[mode2][thisButton]);
}
else if (newState == RELEASED) {
Keyboard.release(keystrokes[mode2][thisButton]);
}
}