Notes/Domino 6 and 7 Forum : C++ APIs Problem

Hello Folksm

Basically I am working as a software engineer writing code which can reate/modify/delete/suspend/restore Notes Users for Domino Server 6.0.1
I have written this code in C, now I am writing the same code in C++, but coming across some critical problems while writing the code.
I have the following problem:

1.Mail Template File vs User Creation (LNCertifier::RegisterUser())
why I can not specify a mail template file when I register user using C++ API (LNCertifier::RegisterUser())?
The LNRegistrationOptions class does not has a "SetMailTemplateFileName()" function.
Is there any way I can specify the mail template file while user creation with the help of LNCertifier class

2.Creating Roaming User using C++ API
I am trying to understanding the roaming users concept in Domino Users 6.0
But do u have any idea, about the APIs in C/C++ to create roaming users.
I have used C APIs (RegNewUser()) to create users on Domino Server 5, but now want to create Users on Domino Server 6 with roaming user feature.
Any links, where I can get help about the APIs/Code to do this...
right now, my aim to find the necessary information to create roaming users for Domino Server 6.

3. Mail File Owner Access
There is no option in C++ code to specify mail file owner access while user creation using LNCertifier::RegisterUser()
Any idea where can i get it from?

4. Creating personal address book for a user while creating a user.
Now, I am using LNCertifier::RegisterUser() C++ Notes API to create/register user on Domino.
But I have no idea about how to create address book for this user.

Your expert comments on the above queries would really help me in proceeding my work.

waiting for your reply....

Sunil Rashinkar