Hello,
To have Start Menu open automatically upon boot, I don't think there is such option in Start11. You can try to write a batch file for it and set it to run at startup. Just make sure it run after all other application that load on boot have finished loading. Else, it will steal focus and make your start panel auto close itself.
Keyboard command for open up Start menu is "ctrl esc"
Thank you.
Basj,
Stardock Community Assistant.