Our mailhub runs spamassassin but it has no users. We can configure the MTA to
lookup users and read a value from a file. This value could be used as the users 
requested 'required_hits' value, and a command-line value would override any
system-wide value we set. At the present *all* users (i.e. all mail received for
our users) have to use the system-wide value. E.g. something like 'spamc -l 8'
to set a required_hits value of 8 for the users message the mta is currently
processing. The problem is some users will accept our system-wide value, others
will want it higher or lower. The option should be passed on to spamd.

More ambitious maybe is to use something like 'spamc -o required_hits=8', where
multiple -o options could be used to specify the various configuration options.
It may only be applicable to those options having a single value - numerical or
boolean.

Thanks

John.