What's the recommended way to add a user to Mac OS X Server that doesn't need all the hoopla associated with Workgroup Manager? There are many users pre-configured in Mac OS X Server (www, root, ldapadmin, etc.) that don't have "Full Name" or mail accounts, etc.

I'd like to create a 'svn' user to be the owner of our Subversion Repository as per this tutorial:

If you've decided to use either Apache or stock svnserve, create a single svn user on your system and run the server process as that user. Be sure to make the repository directory wholly owned by the svn user as well. From a security point of view, this keeps the repository data nicely siloed and protected by operating system filesystem permissions, changeable by only the Sub- version server process itself.

Wondering if there's a way outside of WorkgroupManager and OpenDirectory as this account will be entirely server based. Is this still sound advice under OS X Server? If so what's the easiest way to create the user (Mac OS X Server doesn't seem to respond to useradd).