Hi Maverick,
So I am still in the same situation regarding this problem. I do not want the author to be displayed under his real first and last name, but only his username. It works in the module (when display name is set to login name under the integration tab), but I can see still the full first/last name of the author in the forum menu item.
Secondly, you said there is a bug with easy profile integration as, when displaying the topic, instead of the name or username, you have a strange long string <a href='/websiteadress.ext/index.php/component/jsn/username?Itemid=">First/Last Name</a>
I cannot open my forum to other users because of this problem as they will certainly not want their full identity displayed.
Btw, the Content-CJForum and User-CJForum are both activated.
Please help.