AFAIK:
1. If you mess with anything you don't know how to use, you may brick. Most are repairable, but Full Bricks are unrepairable unless you have BootMii as boot2.
2. You can hack your Wii U in Wii Mode to use custom tracks. It is possible to do it without hacking, although you can only run 1 HBC app at a time. Use LetterBomb to hack your Wii if you choose to go down that line.
3. No such thing AFAIK.
4. There is no mod for Wii U, it must be done in Wii Mode. And yes, I'll put instructions in a new message, cause this ones gotten clogged up. :)
5. They will refuse to repair your Wii. In some cases, they used to make you pay, even if your warranty was still in play, but they don't do that anymore.
6. Yes. You're right.
I've hacked my Wii and it was a great decision. Trust me, the custom tracks are sooooooo fun!!
Hopefully that covered everything for you. If you need anything else, let me know.
JjStAr
Edited 1 time(s). Last edit at 08/09/2013 11:26PM by JjStAr.