Great plugin Marco. I have been using it for long time and appreciate all the effort you put on this.
I have been wondering about the following. Is possible to replace the subject line sent to the new user? I noticed it says "[blogname] Your username and password" but actually I am not sending the plain password so removing the "and password" or change the entire subject line makes more sense in this case.
Basically the case is the following, I am letting the users to enter their own passwords, and someone complained a few days ago that the password was sent plain (no encrypted), he is right, so I removed the PASSWORD from the settings page, but the subject of the email still has it. Any advice will be appreciated. Thanks.