I don't really like message walls because they aren't fully customizable as the classic wall. But I wouldn't mind message walls, just the I prefer the old wall better.
Hmmm maybe...but it's not really necessary.
A few rollbacks wouldn't be bad. But there should only be 3 rollbacks at most.
Yea totally agree on better navigation.
And yes to more people in chat! The chat feature was barely added a few months ago to this wiki. But I bet you if this wiki had had the chat feature for two years then it'd probably be a one busy chat.