@CuriousG: if you unplug the microUSB cable, then press and hold the pushbutton onboard, then plug in the microUSB cable while holding the button, and then release the button, that will get ESP8266 into programming mode waiting for a new firmware to be uploaded. This is fairly common procedure to program ESP8266.
Note that when auto-closing the door (i.e. due to automation setting), there is a mandatory buzzer beep — this is just to conform with regulations. In case someone is working nearby the garage door, this will notify the person to avoid any potential danger (this is mandatory even though all garage door systems already have sensors to sense blockers).
@lawrence_jeff: I was just responding in another thread that the changes you made are great and will definitely take a look and integrate them into the master branch asap.