Phantasy Star IV's Macro system. You had up to 5 playable characters at a time so going into and giving direct commands for each one was a pain so the Macro system helped with that. Outside of battle you can setup up to 15 different macros choosing what each character does and the order they attack. This enables you to get through many battles extremely quickly making combat much less of a chore then pretty much every other JRPG out there. On top of that it felt somewhat like additional customization, you'd always have an 'everyone attacks' macro by default but you could make macros for healing, buffing, every members best attack, specific skills to trigger a combination attack, ect.
It's such a great system and unless I'm mistaken no one else has ever tried even doing something like that, certainly not any games I've played.