I'm a disgruntled LastPass user who recently switched over to 1Password, which I am loving.
I'd like to see a Autofill+submit feature for logins, when a user has intentionally entered their master password. It's a feature that could be dangerous but I think it's worth it.
I find that it is not a pressing matter really, because I can use 1Password to set a keystroke to autofill (if there is a one default saved login). In any case, the feature I speak of is not useful for people (like me) who may have several logins for a given website.