We can thank Talli already for investing in WebDav. I think its on its 2nd stage. They are moving from C implementation to Tcl implementation. Not sure if it together with aol4 webdav or a different one.
If BCMS does go 1.0 (I hope :)). Atleast for 1.1 I would like to have a bcms-ui-webdav package. Or something like that. Although I don't have much knowledge in WebDAV. So I can't really comment anything. But it would be nice to concentrate on the backend and leave it to dav enabled client like dreamweaver/twingle to put the content.