Hi Herbert,
Yes, a run-time configuration option would be the best.
I've just added a new "-b" flag to rnews so as to enable that option. Patch here (for possible inclusion in a new upload of the Debian package): https://inn.eyrie.org/trac/changeset/10375/Also note the "-v" option, already present but somehow undocumented in the man page, that will log the reason of the rejection.
-- Julien ÉLIE « Aliud est celare, aliud tacere. »