Here's some things that could be better.
1: A PS3 version. (Maybe just one more remake.)
2: Characters could block a little more as sometimes, it can be a little too easy.
3: Clique leaders in freeroam. (At least Russell is around.)
4: Prefects should fight back at someone instead of just busting them all the time.
5: The Wii version could have a little more realistic controls as if you're really doing something.
6: When zoomed in, a message gets in the way. Even if you're watching a fight. (Wii version.)
7: Improved Phisics.
8: Different punishments like cleaning up a mess instead of just mowing the lawn.
9: More weather changes, like snowing more often instead of just in chapter 3.
10: The Rubberband Ball glitch needs fixing because after you unlock it and load after saving, you can't use it anymore.
Here's all i can think off. Tell me if they sound good.