I totally fail to understand how the Mark allocated to a question might influence the answer. Can you give real-world examples?
Joseph 
No, not the same problem! In his original post, Jeff complained that the quiz "will still display all the questions and all the students answers they have chosen".
You complain that the students will see their final Grade. This is different.
Moodle 1.5 is a really old version now, and I cannot say anything about it. But I can say that in Moodle 1.6 or 1.7 you can set a quiz in such a way that students will not see either their responses, the answers or their total grade after completing a quiz.
Joseph
What do you mean by "this feature"? What do you mean by "the issue"? Do you mean that the "bug" you reported was not a bug after all? Please, try to be more explicit..
Joseph
Hi Patrick
I did take 10 minutes to thoroughly test your scenario, in Moodle 1.7.1+ and all I can say is that there is no problem whatsoever with "disappearing" questions.
Joseph