FF4 scales the speed of combat based on the agility stat of your party's "agility anchor". In Free Enterprise, the anchor is always the first occupied party slot (in the sequence of middle, top, bottom, top-middle, bottom-middle). However, in vanilla FF4, if Cecil is in the party, then he is the agility anchor, regardless of position. Enabling this flag will restore that behavior, making the first Cecil in your party the anchor, if present. (Note that this overrides the Chero agility effect, if playing with the hero challenge.)