In most cases, forum user names are not "proper names" that one would use as an author name for their articles. Plus, if a user has an article that I promote to the blog, I don't want to use a forum user name as the author name. It looks unprofessional for a blog, but there is not alternative, outside of changing forum usernames to a full name.
If we had the ability to have a user name and "public display author name", that would solve the problem. By default, they could be set to the same username that is an editable field.
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