Hi bartr,
thanks for the answer - the suggested approach is a good idea, but might be a little too restrictive: I would like to apply different templates to folder nodes and document nodes to always display a search box and feedback button, breadcrumbing, and display not only the children of a space but sometimes a tree with limited depth (up to three levels).
The WebDAVServlet class contains code to translate a path to a node reference - guess that and URL rewriting should allow me to do what I am looking for.
Regards,
Markus