There you go. Just uploaded version 1.3.0 which adds this functionality.

You copy the user name and password by clicking on it in the entry display dialog (the dialog with the semitransparent black background showing the entry). You will then be asked whether you really want to copy (this is done to avoid accidental copying of sensible data). Also please note that the clipboard is cleared once the entry display dialog is closed. This is done to assure no sensible data stays in the clipboard longer than absolutely necessary.

Additionally, this version highlights URLs entered in the notes field and makes them clickable as links. I.e. when you click some highlighted URL the browser or other associated application will open with that address.