I agree. I no longer go to carnivals because I don't care for the vendors screaming insults trying to get my money. But when I did go, the fun house nearly every time had a large woman or man stuck inside the rotating tunnel just trying to exit. In my earlier year this was funny shit but not so much now. I agree that going all the way around would be dangerous that's why I said use padding. But if it makes you feel better, there is no way it can go all the way around with more than one person in it, unless the two people had time to rock back and forth to really get it going. If one person is inside it and decides to go for a full 360 (much like in the fun house) I say, let him...It might be fun.
-in the case of actors spinning it while people are inside, this would be nearly impossible, but say he or she does with two people inside. Yeah, that might be a problem. If you don't have any set laws or management in your haunt (giggles), then you can always build this tunnel so that it won't spin all the way around.