I initially configured another folder called "Other Inbox", and then a rule to move ALL incoming e-mails into this folder. Then I have a list of e-mail addresses which automatically move into the Inbox. The only time I need to log in to the e-mail account and update settings, is when we need to add another e-mail address to the list.
This works very well for us because we can still review other incoming e-mail which might be legitimate in the "Other Inbox" folder. We haven't had spam come in however, I'd expect them to go into the Junk E-mail folder. Might this solution work for you?
Although I was also originally thinking this feature would be great, I was wondering how it might affect other organizations who deal with a great deal of spam. Perhaps its best for performance if the SmarterTrack server did not have to process these requests. When initially setting up POP, I had some really bad performance issues when it simply failed to connect. Then again, I'm using a measly dual core 2.13Ghz with 4GB RAM.