I have this as a system-wide mapping with Karabiner. Complex modifications, "Post esc if left_alt is pressed alone". There's never a time when I wouldn't want

I have this as a system-wide mapping with Karabiner. Complex modifications, "Post esc if left_alt is pressed alone". There's never a time when I wouldn't want this to work, may as well enable it everywhere. Edit: It looks like I misunderstood what that setting in iTerm does. But hey if you do want left option to send Esc by itself, that's how to get it.