Astrum

If you didn't know yet: http://mumble.sourceforge.net/Ice - the plugin could be made in just PHP, or in tons of other languages ICE supports; looks very flexible. I'll try to look into it more, but I am horrible at managing databases, so I don't think I could do much without learning a ton...

ICE should be able to handle most Mumble plugins. Though if you need more, there is http://mumble.sourceforge.net/slice/ ... but ICE should be able to handle most stuff.

Good luck if you ever decide to look into it more, and thanks~.

Edit: this should be a huge help if you look into it more: http://gitorious.org/mumble-scripts/mumble-scripts/trees/master/Authenticators - I don't think it would be too hard to convert to VBulletin-supporting, but I am not sure as I do not own a copy of VBulletin. Though I think you already know this