Ok, here is the solution for the 9.2!!
add the user without the dot , then edit the /etc/passwd line of each user and save, exit....
then, run pwconv to update etc/shadow and run grpconv to update etc/group.
If you have a look into the home dir, you'll see the users still ave no dot, but if you log onto the box or log in through mail or whatever, you will need to use the name WITH the dot. So setting up mail accounts is a bit of a mission if you have multiple users with dots (as i do) but at least it works!