Editting comments after preview by hitting a back button is not a good UI design
Lots of people are browser-unaware. They do not know about back/forward buttons. They only know how to click on urls. Please make the comment preview screen have an 'approve' submit button, as well as the edittable form box.
This has been stated here as well as other replys. I totally agree. As a Debian Developer, the license field is very highly used when we are looking for new software.