Moderated + restricted - the other way around?

Hi there,

I'm trying to both cut down on SPAM and the moderation work I need to
do on the MLs I manage.  So I envision this scenario:

- I trust my subscribers; their posts always go to the list.

- When a non-subscriber posts, I get to moderate by adding an
  Approved: header: Mails with a valid Approved: header always get
  through as well.

Unfortunately, SmartList seems to work the other way around: when I
combine moderation and restriction, all posts need to be in one of the
accept files *as well as* being approved.  (This notion seems much
less useful to me in general.)

I'm trying to get around modifying rc.submit outright, but see no way
to do it via any of the rc.local.sXX.

Any suggestions?  Any help would be much appreciated.

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla