This script is currently broken upstream since it currently doesn't build properly for Python >3.4 This script installs libcec and it dependencies. Further more this script symlinks the system wide packages to the Home Assistant venv so they can be used with Home Assistant.
$ sudo hassbian-config install libcec
No script available, maybe you could write one?
If so, add an PR here when you are done:
homeassistant/hassbian-scripts
Running as: homeassistant
For more information about this, se the component page
This script was originally contributed by @Landrash.