The developer team behind Adobe Captivate posted some widgets on their blog a while ago. These widgets can be used to manipulate the way that your quizzes behave and look.
The widgets should be inserted on your first slide and set to “display for rest of project”
Read the full post and instructions here: http://blogs.adobe.com/captivate/2009/09/widgets_to_streamline_your_qui.html
Download Widget to hide the skip button
Download Widget to hide the clear and submit button
The widgets are AS3 widgets so you can only use them in Adobe Captivate AS3 projects.