a) its canada, waivers don't work anyways (as do prenups...they are useless)
b) whistler does have insurance but generally the legal system applies responsibility on the person taking the chance. Its actually pretty rare here for someone to win a signifigant case. Gotta love canada, I hope we never become like the lawyer leeches in your country.
c) TroyLee - yes, where the back-o is, is the original dj park. Its improved quite a bit
d) dirtjump - thats what the mountain is for, this is a bmx style dj park. And whistler isn't about going huge, its about progressing. There are bigger gaps and drops elsewhere. I imagine the bigger section (where the back-o is) will get to be bmx jumps with maybe 15 to 20 ft gaps. Last years were about 10 ft or so...but the point to these is to get tonnes of air....not distance.