The new amazing Navigation Block for Moodle 2.0 always shows course categories the course categories. This is surely fine in many situations, while in other it could be preferred to show only "My courses". Same happen to breadcrumbs. For example, Think to large sites with huge number of categories and sub-categories. Currently, the only display options available for navigation blocks does not allow to hide categories form the navigation block, and breadcrumbs has limited configuration options. Possible solutions:

• for navigation block, introduce a new drop down box setting "Use My Course link only"
• for breadcrumbs, add appropriate configuration items