Thanks, I've managed to add my Twitter button.
I don't disagree with you, I think it does look nicer but functionally, personally, I think it's an issue. If I wanted to add to what's alredy there with a username and password box and login button (without the login period combo) I know I'd need to replace this:
$txt['vp_welcome_guest'] ,' <a href="', $scripturl ,'?action=login">', $txt['vp_login'] ,'</a> or <a href="', $scripturl ,'?action=register">', $txt['vp_register'] ,'</a>.
But what would I replace it with?