This controls whether you can invoke a d/VUE-inspired feature of the same name in which the control commands ^S^H, ^S^J, ^S^K and ^S^L can be used to change the default cursor advance direction to left, down, up and right (default), respectively. This feature can be handy for laying out forms, but if accidentally invoked could wreak havoc on a blind typist, which is why it is not enabled by default.
