As opposed to "shared static this() {}"?
It would appear to me that very bad things would happen as soon as you start using enableWorkerThreads(), which I would imagine will become the norm at some point. Even if vibe does handle multiple initialization gracefully, I'm pretty sure a lot of users would be surprised at their startup code running multiple times.
I'm worried that I'm not seeing something important here.
Vibe is pretty darn awesome by the way. I've been playing with it for a few days now and am loving what I'm seeing (mostly).
Francois