>Yes you can, it's called the Site title in the global settings. It would be logical to be able to edit the footer that way too.
That is only used in the title, not in the page. Is a completely different thing and required, because there must be something on the title.
>Hot boards that get a lot of users and posts have more chance of receiving abuse.
What kind of abuse?
>Users are content and content is users.
No they are not.
>A thing as IDs exist, thus no imageboard is 100% anonymous.
Ids are limited to threads so people can follow conversations better.
>It would be a handy feature to see if a user is legit or not.
Why would that matter? Either a post break the rules or it doesn't.