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Because I use USB Windows keyboard on my old Intel Mac Pro, I do find it difficult to get into the boot menu.
So to help me with that, I wanted to always boot into the boot menu where I can select the startup disk.
Thank goodness this can be enabled in Terminal with:
sudo nvram manufacturing-enter-picker=true
Note that this requires elevated privileges (sudo) so it will ask for your password.
To disable it again (default setting):
sudo nvram manufacturing-enter-picker=false
