Let me try and help clear this up. I think what Alexzander and Jennestia (Hey! I think I got a fan group now! lol) are basically saying that jump should be used as a simple automatic funtion when the need arises to jump. It's basically like the Auto-Attack from XI when Jennestia is talking about the A.I. By this I mean that even though your character is attacking, you're not giving direct commands other than to attack and/or disengage.

Now to just go a little more into her post and using that example I just said, what she means is that the A.I. will automatically jump when the need arises to jump. Hope this clears it up for you.