/assist <p0>
/wait 1
/attack <t>Picks up whatever your party leader is fighting and attacks it. Keeps the whole party on one target without anyone calling it out loud.
<stpc> opens a player selector rather than casting immediately, so you keep your enemy target while choosing who to heal. This is the FFXI answer to a mouseover macro and it is genuinely better.
/ma "Cure III" <stpc>