Negative Turing Test now supports deletion
As of r58, you can now tell Negative Turing Test to delete spam comments instead of marking them as spam. (This is in the NTT Options pane.)
I just turned this on here. It worked fine on the test post; we’ll see how well it works in real usage.
Oh, and in case you ever need to delete a comment from a WP plug-in: Use wp_set_comment_status. I thought for so long that WP had no programmatic way to delete comments—now I know that it does.