At the moment, the current version of the Plugin kills quite some spam here – in fact, I am Spam-Free since months now. But there are things like IPv6 floating around, which need to be taken care of.
In terms of programming, IPv6 will be a second blacklist – technically duplicating the current work. But as we evolved a little, I am thinking of API keys to hand out for reporters to have a little more control about what happens to prevent abuse.
As I will start developing I’d like to know about your ideas and wishes for the future of WP-BlackCheck.