I have AM macro'd twice, one goes to <2> or to <f>, you would then arrange your party list so the person in position <2> or focused <f> you know will be at the correct spot for certain situations. Such as the fast jumping dragoon that is already in position behind Ifrit EX while I'm still running back during eruptions, or to get to the bard on the other side of the platform during the half bomb phase in Titan EX, or to get to someone behind Rafflesia when you just broke a vine, ect.
The other AM macro I have it going to <2> through <8>, for situations where it doesn't matter who you AM to, as long as you AM, such as Levi EX during the slams.
Also test out Manawall and Manaward on stuff, to see which ones they block. Usually Manawall for a physical attack, Manaward for a magical attack.
*edit* Oh yeah, if you are using a mouse control, you'd just need one macro with a mouseover