I think he was going for educating them to get less spam in the first place & when not to use junk/spam as delete.
What your expanding it to has been requested before:
Bug 3870 - per user Spam Assassin score
DSPAM...
This is also interesting:
AboutMaia - Maia Mailguard - Trac
individual & system wide spamassassin bayes training, (domain rules can override any individual's rules), amavisd-new, and it uses either two SMTP-based mail servers in a dual-MTA arrangement
OR an SMTP server with re-injection capability (e.g. Postfix)
It uses an older/custom amavisd-new 2.2.1 even though 2.5.2 came out this last june -reasons are here:
AmavisVersion - Maia Mailguard - Trac
But from what I'm understanding you could technically add another on top of that? "supports a wide range of virus scanners, and can use multiple scanners for layered protection/one or more virus scanners supported by amavisd-new"