As to #1, I've been wanting to use Xuggler to do that with LWJGL for quite a while, but I haven't had time to do any full-on development. But yeah, I agree, the way they force you to set up Xuggler is a pain... ideally, you could simply make it work like LWJGL - have the native libraries present on the user's computer, point a Java System property in the right direction, and bang! Xuggler is operational. No idea if this is actually possible with the way they do it, though.
But I really, really, really think LWJGL needs to have cinematic functionality (even if it's through a third-party library), and needs to let people know how to use it. A suite of tutorials would be really nice. Maybe I'll put some together once I get around to making movies in my games.