Then again, there's the advantage of having something included as a standard part of Zope.

Yes, thats true. I would like to see this being rolled into the standard zope (and there is a Collector entry saying that), although I think its unlikely given the 'competition' from VHM. Having said that, a big patch is worse than a small patch. And http://www.zope.org/Members/htrd/howto/host-server is a really tiny patch ;-)