In the new minimify theme we use a newer lightbox which has some of those advantages. Its not as nice is this one though.
We can’t really globally update all the lightboes which are already installed but new themes should come with this lightbox i think :)
I really love slimbox made with mootools, especially since it renders valid CSS, unlike lightbox 2.0. Plus mootools has some awesome transitions to make slimbox put a little wiggle in its walk. I’m working on a site right now that uses mootools instead of scriptaculous and prototype. I’ll post a link when it’s finished up.