Auto-delete users who have not registered a key after a month of no logins.

[Headcrab Zombie]

There was a time when you didn't need a key to post. He's talking about those users.

But those users wouldn't have their accounts deleted

I am sorry, but it would require a lot of editing to make such a thing possible.
The way websites work they have lot's of limits.
Everything is linked together: users to their comments, pictures to profiles, comments to threads

Severing one link will cause errors in other objects

But this is wrong
deleting user accounts and posts is already a default SMF feature
The users who will be deleted will have no posts, so none of your questions have any applicability

The reality is that this would take nothing more than

a single, simple SQL query

[Ad Bot]

[Hawt]

How about this:

After 1 month of no logins, the player's username will be reverted to "Blockhead(idhere)".

Edit: stuff, I thought you meant in game.

[Headcrab Zombie]

Edit: stuff, I thought you meant in game.

How do people keep thinking this when the title says "...have not registered a key..."
There's no way to set a name ingame, and nothing to delete, without a key

[Headcrab Zombie]

whoops hit quote instead of modify