I don't see this as a problem at all (why create one when there's none to be found:):
Move message into Spam: it's a spam that should be reclassified.
Move message out of Spam: it's a ham that should be reclassified.
Don't really care where the mail comes from or where it is moved. This is the beauty of it all, count the key or mouse clicks, can't be less than this:)
Using the expire plugin, the Spam folder will be emptied auto- matically in due time (typically 30 days maybe) without user intervention.
All close to zero maintenance for sysadmin as well as end-user.
This is the part that's made me really excited about the plugin too. I've needed a new spam solution -- my old spamassassin setup was too hard to control for my users. This sounds truly wonderful. (haven't gotten the plugin to work yet, and haven't made time to)
Aria