I may have given you the wrong impression by saying Kixtart doesn't support (for example) IAdsUser - it does - its just that it uses the scriptable flavor of IAdsUser ... example:

$user = GetObject("WinNT://domain/administrator,user")

$user does indeed implement IAdsUser ... its the same if you do a getobject on a Container ... it implements IAdsContainer - the difference is that it implements it at a SCRIPTABLE level - not on a low-level ... and its not guaranteed that ALL low-level objects and members will work at the scriptable level.