I have uploaded a new version now.
The hack is no longer considered as beta, so you should all be able to use it

It's now using the vbulletin product system, to make the install much easier.
For those who have installed the Beta version, you have to manually drop the subforumcolumn field in forum table, before you can run the product xml file.
I'll send out an upgrade, once i have got positive feedback, that i didn't forgot something