Currently it appears that the RSS category feed is limited to return 25 topics. Is there any way to pass a parameter or something in an effort to retrieve more topics in a RSS or JSON feed?
If there is not a way to adjust the feed, are there any other options of exporting a list of category topic titles?
You should be able to create custom export files using the Data Explorer plugin. The Topic table has a lot of fields. Such as name, slug, created_at, archetype, category_id etc.