Pages 25, 77, and 89 of User Management For Mac OS X Server 10.4 or Later contain incorrect statements regarding the inheritance of managed preferences for nested groups.
Nested groups are useful for inheriting access permissions, but only preferences from the workgroup selected during login (not any workgroups via nesting) are used for group preferences.
If you need additional management options for members of groups (or multiple groups), please consider adding additional management options at the User or Computer level.