When I first got into forums, I wanted this same thing to be in effect. For example, when Grayson was staff most people asked who he was in game.
There is an add on for XenForo. My problem with using the add on is it will automatically update even the most foul names. I am just requesting this for staff. Not the entire whole of the user base here.
Why does it matter? Or you could just get https://xenforo.com/community/threads/minecraft-identity-service.15943/ which would be much better.
For this week... She's known to change it quite a bit. :/ (as a admin staff changing names is so annoying!!! I hate it)