i totally agree, although a work around is nice , it makes u loose the auto login, so its not a solution.
I have a similar issue where i may have the same username for various websites, in different subfolders of the webserver.
Lastpass shows me a list of 5 names, all the same ones, and i have no clue.
if i could give that login a name that would be nice, and make more sense as usernames and passwords are values to be used while logging in to an account.
So imho the specific account should be used in the list of logins to a site or service, not the username.
it would solve many similar issues and is just logic.