It would be really nice if the SmartShunt Tx port could be configured for alternate functions, similar to the MPPT solar chargers. On which you can set for example a voltage based load-disconnect or a streetlight function.
For the SmartShunt, it would seem obvious one would want a SOC based load disconnect, though honestly any of the already configurable alarm functions could be useful.
Personally, I would not even put a disconnect relay on it, just a piezo buzzer.