If you have access to a DSP or something that can give you a GPIO output based on a signal being above a threshold you can send the on desk oscillator to an output on startup. I upgraded a system that used this to control the amps. I am not a fan of that method though due to the fact you now loose your oscillator for other uses.
Having the ability to configure a GPIO to go low when the system is fully booted and high when the system is off/safe to shut down would be a pretty handy feature. Also exposing that via an API would be nice for integrating with a DSP such as Q-Sys for full system control