The Logitech Harmony remote is supported out of the box and no configuration is needed.
Add the following device in MyHarmony.
Press yes when prompted.
You can alter the input delay settings to make your remote more responsive as below.
and by adding the following commands to /storage/.config/autostart.sh
ir-ctl -t 50000
ir-keytable -D 375 -P 100
If your remote is not working then check if /storage/.config/rc_maps.cfg exists on your device and if so delete it and reboot and then your remote should work.