Sweet video. I totally agree that it's great to see the back deck roll taboos being addressed. I would go a step further and say that it's frequently appropriate for creeking. I first started wondering about the backdeck roll when I noticed that the best boaters I paddled with were backdeck rolling almost all the time. I actually backdeck roll too often, but sometimes can't help it because it's become so automatic.
However, I can think of many times where it's saved my ass. One example is when I was boating with a way too large group down SSV (read: shallow, manky, steep creek). Not one, but 2 boaters in front of me got pinned and blocked the two channels that were options. I tried to boof the stern of one pinned boater (who may or may not have replied on this thread), and it instantly flipped me. I knew exactly where I was and saw a seriously dangerous rock beatdown coming my way, but I threw a backdeck roll, was underwater for only a split second, and didn't touch a thing. I remember a similar experience on Deer Creek on Bailey on the last part of the drop after the rock slide. I was not paying attention, got pushed against the side of the boof rock, it flipped me, and I backdeck rolled up instantly, touching nothing, and saving me from doing the last slide upside down.
Someone was talking about hits to the helmet, and I said I can't really remember the last time I took a hit to the helmet. I thought about it for a bit, and said, you know, every since I started backdeck rolling, I never hit my helmet. If I strike a rock underwater, I just push off it with my paddle and it rolls me up.
Anyway, I'm always surprised when I find class V boaters (or any boaters who know how to roll for that matter) who don't have this roll in their arsenal. It's not the end all be all of rolling, but I find valid uses for it all the time. Start paying attention to how many times you flip when you're on your back deck and how many times you flip when you're aggressively leaning forward. I bet you're on your backdeck at least 75% of the time.