How to disable updating username for admins & moderators?

[pfaffman (Jay Pfaffman)]

@Jagster

If someone can’t follow such trivial rule could that person follow any other rules either?

Exactly. If you don’t trust your admins and moderators not to change their usernames then you have dramatically bigger problems than their usernames getting changed.

But if CSS isn’t good enough, a custom plugin could disable changing usernames.