If you think that can be done with RPG Maker, you've got the wrong idea. Nothing complicated here, you EQUIP WEAPON and USE POTION. You can CHANGE JOB too, but that requires a custom-coded menu for some reason. It's more of a FF5 type of thing, though most come out as "complicated" as FF4 since people seem to hate coding.

I'm not sure if you're just looking for a FF7-alike that you can plug your own story onto, but most people gave up on remaking FF7 a long time ago, since they'd have to recode basically every part of the game anyway.

Again, stick to FF4-FF6, those are mainly possible with RPG Maker (well, except the Esper system in FF6, but that could be coded by someone willing to destroy himself/herself for a game)