I have updated the plugin with the following two options
1) Anonymous Users must supply credentials when creating Topics
- Adds input-fields for email and display name (Just like when adding a comment in WP)
- Is limited to the topic-author, no validation of following posts.
2) Anonymous Users can only reply to their own Topics
- Prevent anonymous users from replying to other topics than their own (uses the email as key)
I guess when the meta system is extended to support meta-data for posts, then one can also require credentials for anonymous users posting to other topics than their own.
I can email the new plugin-code if interested (or create a patch).
