You can just add a custom field, and use it for the Screen Name.
If you want to use that field for the emails, you would have to change email_notify template, and replace $touser[username] with $touser[field5] but change 5 to the ID of the custom field you added.
To use this new screen name on the posts, replace $post[username] with $post[field5], and again, change the ID.
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