I think we discussed this a long while back when the game/site was launched and this issue appeared, not so sure if there's a good way to sort this one out due to how it all works in general when it comes to nicknames and usernames.
I'm not even certain if it's possible, but if it is, we'd most likely lose the power completely being able to set a unique/own personal nickname here on the site, and instead everyone would be forced to have their username they registered with shown on their posts like profile. But that's if it works of course which I'm not certain of it being after giving a quick eye, raz should be able to do his magic if it was an absolute must however, which I'm not certain I find it being.