Sorry for the late reply (inet connection problems).
I'm more than interested in quats and I have an implementation in our project (heavily used in skeletal animation). A complete implementation would be great in the LWJGL vector package. Although I'm not using it (I had most of it implemented before it showed up), I might do sometime.
One note about all math packages: If you create an object behind my back I'm not going to use you! I'm not really familiar with the lwjgl vector package, but that is the main reason I don't use Java3D's (and preferred to do it myself). So the request I have is (for you and anyone responsible for the math package) to provide as many methods necessary to avoid having to create loads of new objects.
By the way, I can't download your code.