Add slot to the ISO?

[xpm]

Hi, i'm trying to hack Super Smash Bros Brawl, but i wanted to hack the backup of my game beacause i don't like to use geekos or reevolution.
I wanted to had many chars, but 40 slot are too few.
i wanted to add some slots, I know that is possible using hack to clone the chars? slots, but is there a way to do it also by directly editing the ISO?