Ok! Do this
1) Get Dat Editor.
2) Get your plistps2.arc and your ch.pac files.
3) Put your ch.pac files into your svredit, and also put your plistps2.pac into the folder.
4) Use expert to extract the stuff from your ch.pac or plistps2.arc. I haven't modded it in a long time so it can be either one.
5) Find something like DAT_.pac that is extracted or something similar.
6) Use your "QuickBMS" and then select the Yukes plugin and seleck the DAT.PAC (or something like that), it will extract ALL superstars information, you'll find the ids listed, and you'll see the files correspond with the extracted information, enable the superstar you want via your Dat Editor, and import your superstar into the game, replace the files in your iso and rebuild....... It doesn't get easier than that.... Its so simple and it works, if you do it. You'll see that it works, try it, if you don't want to, then go look for other methods, because this is an alternative method to the svredit one. This does work. If you still don't get it, ill create a tutorial tomorrow...