[Zope] User_Management - Two Folders in different branches

[Carl Blesius]

I have a basic Problem with
ZOPE USER MANAGEMENT

Roles on our site root:
Anonymous User Author Editor Manager Owner

Okay... lets say I have one folder

/users/John_Doe/

with an acl_users folder in it with one
user (John_Doe).

After John_Doe knows his way around Zope
well enough I am going to let him take
over a branch of our website 
e.g. /clinics/pathology/ 

How do I grant him access to that area
of the site without having to create another
acl_users in that folder? (A single password
and account per user would be nice, as well
as a single password_change mechanism for
all users) Would a the LDAPLoginAdapter solve
my problems (does it allow one account access
to specific folders in different branches of
a site)?

Carl