It's sounds like a rather painful thing to do. ezPublish's templating is deeply ingrained in a lot things. You'd have to write a lot of code if you want anything beyond even the most basic things I'd assume.
But yes, it can be done. There have been threads lately about it.
I just want to store plain and simple content, and get it via XML for display on pages. Basically use it as an XML/data repository. If that can be done then all is cool :) I will install it tomorrow and play with it and see. Most of the CMS" I've come across are ingrained with portal/application framework stuff, which I don't want.