Volume Up/Down works only with FN Hotkey Driver and patched AppleHDA. To enable brightness control you must install this kext https://osxlatitude.com/index.php?/topic/2167-display-backlight-driver-for-asus-notebooks/ and make some DSDT edits (PNLF). I don't know how to enable Fn+F2 (BT, Wi-Fi) - it works randomly. Fn+F1 (Sleep) works OOTB.