Hi Bruce,
As far as I know, each shared replicated folder under a DFS link need to have replication method to replicate the content among the shared folders.
You may consider establishing DFS replication groups for each DFS link.
For regarding the staging folders size, I would share the following document and TechNet blog for your guidance.
Staging folders and Conflict and Deleted folders
http://technet.microsoft.com/en-us/library/cc782648(WS.10).aspx
Staging Folder Guidelines for DFS Replication
http://blogs.technet.com/filecab/archive/2006/03/20/422544.aspx
Hope this can be helpful.
Best Regards,
David Shen
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