I would like to second this request. I have to have two entries/items for the same account because many of my accounts' usernames require different format depending on what part of a website I'm logging into or whether I'm logging in from on-premises or from the internet, etc. So usually this ends up being one entry with just the username and one entry with the full email address. I can't find a way to auto-fill with two different usernames depending on the scenario.