[Zope] specifying a different default view than index_html

[Mitchell L Model]

Is there a way to specify a different default for when a folder is 
viewed so that it doesn't use index_html?

Here's the situation: I have a hierarchy of folders.  I want 
everything except the root to share a common index_html.  The root is 
special -- the entry to my site.  I don't want people to have to type 
anything other than the path to the root folder to enter the site 
(though if there's no other way to do it, it won't be a big deal if 
they have to add a specific .html file to the path).  When they enter 
the site, they should get a different view than the default 
index_html.  So, I need a way to either change the default used by 
the root or the default used by everything else.

I realize I can interpose another level of folder between the root 
and everything else, in order to store defaults I don't want shared 
by the root.  I may do that if there are more defaults I don't want 
shared with the root, but right now index_html is the only one.

I'd be interested in design  suggestions regarding this issue as well 
as hints for mechanisms to use.