I would like to suggest that when someone clicks on radio button "No, create an account now." during registration process password field should be hidden instead of not being clickable.
A few of my forum users had complaints about that part of registration process. They got confused because after you click on "No, create an account now." password field is still visible, but not clickable and they keep trying to click on it. Those users are not tech savvy, so from that perspective I would guess that hiding password field would be better solution.