How to add a "Start/Stop Audio System" Action Button?

Hi.
I’ve seen that Ardour keep my CPU in use (for DSP) when I need to pause the work. But sometimes I need to deliberately Stop the Audio System and go back latter (without suspend the computer). Is there a way to add a custom Action Button to do this, instead of going to Window > Audio/MIDI Setup > Stop/Start ? Or some kind of setup to auto stop the Audio System when 5 minutes idle, maybe?

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