Nickname vs Username vs Display Names
Additionally, a drop down “helper” should speed up tagging by offering suggestions of the @name so we need not type out every single letter, every single time.
Sorry, but could you please explain the issue in 1-2 sentences? We don't have enough time to read such a long questions.
In case you want to say thank you !)
We'd really appreciate and be thankful if you leave a good review on plugin page. This is the best way to say thank you to this project and support team.