Unfortunately it's nothing that crazy - IIRC original keybinds came from gathering what various people in AI lab used in TECO visual mode, then evolved from the

Unfortunately it's nothing that crazy - IIRC original keybinds came from gathering what various people in AI lab used in TECO visual mode, then evolved from there with the quite simple element of having Bucky keys mirrored on the keyboard so modifiers were really easy to use.