I have submitted a patch to SourceForge for consideration.
The benefit to the list admin is to have a one-click setup option to provide them with mirroring and searchable archives.
We (me and the other Jeff that admin The Mail Archive) have spoken with Lars at Gmane to see if we could make this work for Gmane as well, but he said their subscription process is manual and requires extra information, so Lars didn't think it would work for him.
Patch was made against the latest CVS in branch Release_2_1-maint, which is currently 2.1.6rc3.
Jeff Marshall firstname.lastname@example.org