If the user has achieved a high rank in the forum, and choses to change his username, will the account be suspected of changing hand and be tagged for that? If yes how will other users know he is still the rightful owner?
And if there is a change of username, there should be an announcement of request so the community will not be surprisedd of that username having their feedback on that account.
Well, I think there's no need for such an announcement, because the announcement isn't said to guarantee that the admin or theymos will grant your change of name appeal. Just a PM to the admin should do, and if he grants then all good, everything would still have to pipe low because the entire community doesn't have to know except the user chooses to beat the drum.