Bamboo should support nested group permissioning

I have Bamboo 2.0 setup with LDAP integration with Active Directory. We have a setup along the lines of:

• GroupA
  o GroupB
  + UserA
  + UserB
  o GroupC
  + UserC

It would be nice to give all users in Group A access to Bamboo but that doesn't appear to work. I have to explicitly give Groups B and C access in the global permissions configuration for any of the users in those groups to have access to Bamboo. Have I missed some configuration option somewhere or is there an option I can set in the atlassian-user.xml to enable Bamboo to include users with a Group depth of more than 1? Or is this simply not possible and I should just explicitly add each of the sub-groups?

From http://forums.atlassian.com/thread.jspa?messageID=257282143#257282143