This is a very useful feature - like in the video you've linked - the input probably is good to place in the "ask", "answer" and maybe "comment" form. It will be harder to implement this feature for the comments, easier to start with questions and answers. I think at the minimum the "post as" field must have an autocompleter to select the user.
Evgeny ( 2012-07-10 12:41:49 -0500 )edit
Yes this a good addition to get initial traction for any new-forum.
pajju ( 2012-07-30 14:00:21 -0500 )edit