I use two-factor on some sites that require appending a passcode to the actual password. It is great that lastpass stores my password and auto-fills it and then I just have to append the passcode. However, every single time I do this, lastpass prompts me to store the "updated" password. Of course, the password has not been changed; it is just that the last x characters are different every time.
It would be amazing if there were a way to tell lastpass to ignore the last x characters in the password for a given site when detecting a changed password.