Users have reported that UBB7 lost their saved favorite topics (in UBB6) , why they are not imported to 'watched topics' ?

From memory, I am not sure that these are imported.

As forum numbers and topic id's are changed; the import map could have easily gotten a lot larger keeping misc data such as favorites; not to mention the importers where well behind by the time 7 got out, so only the highest priority data was imported over (categories, forums, topics, users, etc)

Well , I don't think this is a hard work.

select POST_ID from ubbt_IMPORT_MAP where OLD_TOPIC_ID = old_topic_id;
select TOPIC_ID from ubbt_POSTS where POST_ID = postid;
insert into ubbt_WATCH_LISTS values(userid , topicid , 0 , 't')


I think it is easy to implement in the importer.
Hope ... there will be a importer-patch...