It works the same as the others, and the same caveats apply (works based on the name the commenter uses, etc). In addition to good old dsmvwllng, it also has options for replacing their text with a nice white-on-black REDACTED banner; or it can make the text really small: Look at me, I'm small!. It also has a special "I Like Pie" mode (thanks to d-p-u).
(note: the following text is obsolete, as of 8/2/2011, because the latest edition of the BJ pie filter allows you to add/remove people from your pie list via two buttons on the comment page itself - no more editing required! )
You’ll have to do some minor editing on the script itself - to add your list of targets, and optionally, to change the comment-abusing style. Again, all the stuff you need to monkey with (haha) is clearly commented.
If you’re using FireFox, and you’ve installed GreaseMonkey, and installed this script, just go to the Tools menu, choose GreaseMonkey / Manage User Scripts, select the script and click Edit. (not sure where the option is in IE. you'll find it). The things you need to edit are right there at the top. It’s basically just a matter of changing the default ‘baddies’ names to the names of the people you want to filter. You can have as many names as you want. If you need more help, feel free to ask.