Well i did a bit of work on making a load game function as well and i did manage to make a semi working load (read below) which i was planning to add to the next version of my trainer if i ever get round to it, here is a mini trainer to show you.
Just run this (you can run it from anywhere, it doesn't have to be in the FF7 folder) then FF7 (or vise versa)
http://www.mediafire.com/?1bnn5cm8jidw2vyThen when in game press "CTRL + L" twice slowly and you will get to the load menu or go to the in-game menu and press "CTRL + L" once and it should take you to the load menu,
The reason why i called it a semi working load is because it only works in the field properly, it has some odd effects if used on the world map (really odd effects, here is 1 example - if you are on disc1 world map and then use the load to load a save on CD3 it will take you back to the worldmap where you was on disc1 but with disc3's stats) but if you enter a village and exit again it sometimes fixes the problem but not always so its probably best not to use it on the worldmap if you can help it.
EDIT:- i mean you can only use the trainer while in the field, you can load saves that where saved on the world map fine, just DON'T press "CTRL + L" while on the world map.