I've noticed that people cannot make their own questions CW anymore. They instead have to get a mod to make it CW for them. What is the reason for the change?
It was done because it was seriously confusing new users, and people were creating Community Wiki posts when they didn't need them. Note that you don't need a mod to create them for you:
How does a post become a Community Wiki post?
There are several ways a question or answer can enter community wiki mode, and most of these ways will occur automatically based on the rules of the system.
Posts enter community wiki mode when one of the following happens:
- The body of the post has been edited by at least five (5) different users.
- The post has been edited ten (10) times by the original owner.
So if you edit your own question 10 times, you get a CW question!