Cool, thanks Nathan.
Manual is fine, it means you can help the cause if and when you want to, and who knows, maybe make life a little more difficult for the spammers (beyond the spam just going into a bottomless pit and the spammer being unaware). My thoughts on that concept is it doesn't really help in the long term with the bigger picture or prevent other IPS communities but its value is excellent is you as the admin or your clients not receiving the junk in your Inbox.
Its interesting, I have noticed that sometime SFS lists 'Eric Jones' as a spam email address that he is, other times it doesn't but flags the IP only, even though the email address is often the same; almost like he is constantly getting removed from their database.
I have another suggestion for future consideration, the ability to quickly export and import banned spammers. Sadly IPS removed import/export of the ban filters with IPS4. By virtue of this plug-in making good use of them, it means if you have multiple IPS sites you have to manually recreate the banned email addresses (and IPs if you use them but they usually change).