Revan,
I never bothered with my 3.0.7 board as I went live on 3.5 last week, but loaded this up today and got rid of hundreds of these pesky things in one click. Ran flawlessly -- and quickly.
Thanks so much for sharing this!
@fleabag -- you may want to try to delete fewer at one pop? If you are deleting threads that have a boatload of posts in them, that will be quite intensive...