Hi there !
First I'd like to announce that I am working on static Zafu templates. These are templates like "Contact.zafu", "Contact-edit.zafu", "ContactList--csv.zafu" that live in the filesystem making it much easier to deploy and reuse existing code. The way this is built it will be easy to customize such a set of static templates by overwriting parts of the template (more when I release the whole thing).
The second news is that I started using Selenium to test Ajax in Zena and wrote a short blog post on the subject:
http://zenadmin.org/837. It boils down to "use Selenium or die".