Definitely! As I was watching the movie last night, I was particularly thinking that they should do a (compressed-air) nail gun scare.
I wonder if they will include both the prologue and Mia's story, or just the latter. If they decide to use the prologue, they could have the possessed girl tied up to the post screaming at everyone, and then the creepy religious people could jump out and surprise scare you. Also, I think it would add another element of gore and surprise if splashed you with some (water) "blood" in certain scenes. I don't know how or if they could make it work, but it would be a lot better if the deadites just f:censored:ing curse you out like there's no f:censored:ing tomorrow :saw: