Vegeta intentionally kills himself... how can you say otherwise? Are you Vegeta? It's obvious that he didn't try to stop himself from dying... that was the whole point. If you change it around so that it doesn't kill the user it isn't the same attack, capiche? Do you understand the words coming out of my hands? Do you read me? Roger Wilco? And if it isn't the same attack, you are asking the team to make one up, right? Well obviously, since it isn't a real attack used by Vegeta on the show.
Like I said, the mod makers could make up attacks like you are asking them too, but then it would end up like BFP as opposed to DBZ. That's what the first line was aiming to do... when I said "attacks that are meant to do damage hurt your opponent" you werent supposed to take it literally. Read inbetween the lines. Final Shrine is meant to kill the user in a spectacular explosion. Therefore, it cannot be implamented with the name "final shrine" if it does not kill the user. That would be like creating a generic beam that heals your opponent... that's not how they use it on the show, so it shouldn't and most likely wont be done.
Edit- Now I realize that I am not the developers, and my oppinions are just that; my own personal oppinions. I just speak in the best interest of what I see as a great Dragonball Z mod with a lot of potential, apparently learning more towards accurate characters and attacks than unholstered creativity.