I'm not sure what you really mean by narrowcasting .. but LE boots directly into Kodi, and using a simple autostart.py script you can start a playlist on Kodi startup. For stability and performance use an Ethernet and don't be tempted with wireless. Kodi can be controlled over CEC on most TV's (using the TV remote) and you can deliberately disable IR support (if the box has an IR sensor) to prevent visitors trying to control the boxes. We added an SSH console keyboard in the last couple of days (will be available in the next alpha).
Hope that helps.