I've always thought that topic numbers where less than useful. We find that most customers hate them and ask for them to be removed (unprompted). Shock horror - in Moodle 2.0 they become even more prominent in the navigation block. IMHO, non-mutually exclusive options:
- Make 'topic n' editable so it can have a proper title. Perhaps editing the header for the topic can have an additional "short name' that becomes the topic name in navigation?
- Allow them to be switched off altogether.
Same applies to the "Topic outline" text at the top of a course. Major source of complaint.