using fstfix will not solve the problem for audio streaming games on the wiikey, iirc all it does is resize the image from it's shrunken state to it's full image. gcos's audiofix will also not work with audio streaming games.
you will find that you can play the games for a short while some times, and other times it won't load at all, but eventually you'll get an error.
if you have a wiikey there is no way you can software patch a game with either tool to fix the audio streaming issue with a wiikey installed. I don't know if they work on other chips.