Here are just some suggestions for the forums:
- Allow us to make question-polls on our threads. Almost every video game website I am on has this, so I can't see how SE can't add this.
- Have something that show us when there has been a new post on a thread we posted in and/or are watching, outside of the Settings menu.

If you have any other suggestions relating to the forums, list them below and I might add them to the list. ;D