Jay Allen has version 1.5 of MT-Blacklist ready for you.
We�re talking some serious power that you�ve always been lacking.
Furthermore, thanks to Stepan Riha as well as the removal of comment/trackback filtering (which wasn�t needed with Search & De-spam in effect) every function of the plugin is phenomenally faster.
There are many more changes that you can read about in the documentation, so I�ll leave it at that for now.
I've been an alpha tester for 1.5 so I've had this functionality for a week or two. ;-)
LOL. Actually, I got in because I had contacted the developer about a bug with the original release and he included me as a tester so he could make sure that it worked on my system.