How to access portal services in .Net PDK

The documentation for SAP PDK for .Net says that Enterprise portal services can be accessed from .net. I have a requirement to access some of the UME services available in the portal, e.g. create user, modify user etc.

I was hoping to get an access to these UME functions from PDK for .Net. But I could find a subset of UME service in PDK for .Net in the namespace, (SAP.Portal.Services.UserManagement). The functions available do not satisfy all of my requirements (GetUser, GetRole etc. getter methods are only available).

Does anybody know how to access other services available in EP? Or specifically How to create a user in portal using PDK for .net?

Thanks in advance.