I don't understand why it is ok to stand at the end of the game but not the beginning? Every point counts the same, whether it's the first quarter or last. Getting the team fired up in the first quarter is important. I don't know about the everyone else, but personaly, I am going to be more subdued if i'm sitting. It's going to limit my excitement a bit, and in turn my ability to cheer. I think this is true for most people. They actually had to remove the terraces in English football stadiums and replace them with seats becasue the fans would become to crazy.
Everyone here I think agrees that a rocking arena helps to motivate the team to play their hardest. I know as a college athlete, I would always play at a higher level if their was a bigger, louder crowd.
Anyway, my point is, that in the playoffs, every minute of every game is important. Therefore, if you really want to help drive the team on, you should be as loud as possible. Meaning, I should be able to stand all game. Granted, there is no need to stand and be crazy all during halftime, and probably not needed for long timeouts, but other wise, it should be allowed. I'm paying for my ticket too ya know?