Would it be possible to add an ambient light sensor to the raspberry board of the Mini in order to have an auto brightness like the tables? Up to now I am setting the brightness over the API and an external light sensor, however something included would be more fail safe.
If it is not supported by the software, would it be possible to get access to the pi user account to have a script running to check a photo resistor connected to one of the GPIs?
The easiest way to do this is to use the SisBotBoard (as opposed to direct Pi GPIO). It already has a connector for the light sensor. We can send a out a sensor, but the problem is that it has to "see" ambient light - but LE's and EX's don't expose the SBB to ambient light. You would have to cable it (three wires) - which it sounds like you have the tech experience to do. You will also need to change the configuration file to enable autodim. I will send you the Pi login creds in a PM.