samba - Apr 2005 - smb.conf and adding users

Hi

So I've setup a Samba Server 3.0 , all working hunky dorey except the
creating of users on the fly.

Snippet from my smb.conf:

	passdb backend = tdbsam
	add user script = /usr/sbin/useradd -m %u
	delete user script = /usr/sbin/userdel -r %u
	add group script = /usr/sbin/groupadd %g
	delete group script = /usr/sbin/groupdel %g
	add user to group script = /usr/sbin/groupmod -A %u %g
	delete user from group script = /usr/sbin/groupmod -R %u %g
	add machine script = /usr/sbin/useradd -s /bin/false -d /var/lib/nobody %u



How do I proceed to add users, and groups, and users to groups, etc? 
(Without manually typing the commands above)
SWAT does not seem to offer all of these options?

Thanks.