Can we show the comments form when guest login is disabled?

On many websites, you can enter a comment in a comment form and only when you go to submit it are you required to login. This makes it more likely that people will post comments because the bar to entering a comment is low and once they have put the effort into entering a comment, they are less likely to leave when faced with a login.

Is something like this possible with wpdiscuz? As far as I can tell, if I disable guest posting, then the comments form only appears after I am logged in. Is there any way to actually show the form before login when guest posting is disabled?