Although I think that the fourth movie should be longer, I don't think that a petition will help. I did the same thing once with another book series ~cough~ and I found out that online petitions are useless. There's really no way to tell the difference between about 5 people writing in and "signing" it with different names and 100 different people each "signing" their name. Thus, since there's no way to tell whether the petition is valid. . .

Maybe people could write in to WB or whatever themselves and start an e-mail campaign...