For example
here, with the instructions to launch a homberew. Then, just follow any 4.3E hacking tutorial, it's easy and completely safe with BootMii, especially since you can backup the NAND. It should be easy to google, I just used the first (french) result.
However, I can't guarantee that PSA hacks are region-free, does anyone knows ? I can't say cause my Brawl DVD is NTSC (Wii Region doesn't matter).
I was actually gonna use that one, but it's over Skyworld and I already have a replacement for Skyworld. Unless I can somehow get .rels for Skyworld then I probably won't use it 
If you feel like you don't have enough stages, just download the Classic Expansion Pack, it comes with 36 extra stages, most of them being great, and you can very easily replace the few crappy ones with whatever you wish.
About Joe's God Hand, I don't have time to experiment more right now, but I have a slight "idea" of how to only slow down the hit opponent. I can think of two options that might lead to this result :
* Catch collisions can force the opponent to execute any action. It probably won't lead to anything useful as there's no "slowed down action", but still, you know much more about PSA than I do...
* Thrown subactions can definitely slow down the opponent, but the tricky part is to trigger them with a special. The 76-79 are already used for standard throws, but someone might know what the other ones are used for or how to trigger them. God hand could also auto-chain to forward throw, but I don't think PSAs have access to any kind of global variables... Maybe make it inflicts some status to the opponent before F-Throwing him, so that ThrownF can check for this status then remove it and slow down time ?
Poll
