> support readline bindings (^A, ^E, etc.) Those are emacs bindings. Readline uses emacs bindings by default, but it can also use vi bindings. Unless you mean

> support readline bindings (^A, ^E, etc.) Those are emacs bindings. Readline uses emacs bindings by default, but it can also use vi bindings. Unless you mean that it uses readline and so configuring it (i.e. ~/.inputrc) allows you to change the keybindings of macOS UI text fields. That'd be cool if it's the case.