Here's the deal, in reeeeal condensed for especially for you, xspudx.
Editing anything in FF7 is possible.
Now, face some facts. You are an utter and complete newbie to modding, hacking, dare I say computers in general. In fact, if you plan to learn enough to fix Sephiroth's limit breaks by asking people at these forums, we all would have to spend more time teaching you than it would take us to fix the limit breaks ourselves. And if we're not fixing the limit breaks ourselves because we don't want to waste the time, why would we spend even more time to teach someone who might someday be able to edit something?
Please read that entire paragraph, over and over, until you understand it. The technical parts of these forums are intended for hackers and modders with an interest in FF games. Not for average gamers who suddenly think they can work wonders just because we write programs called "editors". Please don't take our work lightly, it has taken most of us years to learn enough to be able to do the things we've done, and it's nothing you can be taught. You must study and learn yourself, indeed you should already know computers, hex editing, and a bunch of other techniques before even starting.
Game hacking, and the programs we've written to accomplish it, are not aimed at newbies. If you can't use them, they're not for you. This is not something that will be solved by posting "how do i use this?".
So please stop flooding the forums with questions that there's no point in asking. People are seriously starting to complain out of sheer annoyance over your apparent ignorance. I'm sorry if you can't do FF editing, but it's not for anyone. Go and study computers, hex editing, disassembly, data formats, compression algorithms etc., then investigate the various FF7 data files, and when you've reached the point where you're starting to understand how our programs work, then you're perhaps ready to start posting about it again. Until then, zip it and lurk.