[Zope] overriding security acquisition

[ra@burningman.com]

Hi,

I'm building an app that has a security model that is a bit contrary to 
Zope's acquisition path for local roles.  There are folders that 
represent 'team's, and a role I've defined of 'member'.  Some teams have 
sub-teams, and these team folders have the sub-teams' folders within.

The problem is, if I make someone a 'member' of a team by giving the 
user a local role in that team's folder, then that person becomes a 
member of all the sub-teams, since the permissions acquire upward.  This 
isn't what I want.

Is there a way to get Zope to not climb the acquisition tree when doing 
its local role calculations?

-r