http://test.musicbrainz.org/edit/relationship/create_url?entity=798197f3-fed3-4696-ad67-615adf7c1403&type=release has "production" selected by default.

Default AR type should be empty (and a check should be done so you can't submit an AR with an empty AR type), so we won't end up with a lot of unintentional "production" AR.