I *think* the fudging has only come with the mid-length and epic, but we've also had changes in the categories over the years. The list is at http://www.kerthawards.com/2011categories.html , which has the current size limits. Here are the limits from 2004.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited