Making a Command cast a single spell

This will be tricky because Shock uses a special animation for stepping forward. Right now you're using the generic step forward for a normal spell, followed by the Shock animation. So you get two steps forward but only one step back.

C-Dude's tutorial assumes that you're using a normal spell. Since you're using Shock you might want to take a different approach for the animation.

Which spell animation index did you modify in FF3usME for your custom spell? Was it 130 (Megahit/Shock) or something else? Did you just modify the values in FF3usME, or did you also modify the animation script in a hex editor?