selectors in :any

For now, WebKit's implementation of :any is following Mozilla's lead and
only allowing simple selectors. I don't see any need for this restriction.
Are there any objections to allowing all selectors?

I see a similar discussion has happend for :not and that there seemed to be
agreement that we'd change :not in Selectors 4 to not restrict to simple
selectors.*

Ojan

* While I'm asking, what's the status of Selectors 4. Is anyone actually
working on it? http://wiki.csswg.org/spec implies that noone is actively
working on it.