Description of problem:

When creating user from who are the posixUser instance with 389-console, it's
possible to activate checkbox in the "Posix user" and define UID, shell and
other posixUser attributes. But when creating a group with 389-console, there
are no tab or attributes to specify a GID number, and administrator must go
into directory service editing and manually append attributes
objectclass=posixGroup and gidNumber, that can be annoying when creating
several groups:

1. Create a group from "Users and groups" tab
2. Move to "Directories and servers" page
3. Find a server
4. Open "Directory server"
5. Proceed to directory tab
6. Find a group
7. Open properties
8. Click "Advanced" button
9. Add objectclass: posixgroup
10. Set GID number

and if this feature would be enabled, all steps from 2 to 10 will be avoided.
Adding objectlass: posixGroup into a group template does not solve problem,
because there no field to specify gidNumber in group creation dialog.

Suggestion: when creating user with "useradd" utility, user and group with the
same name are created. It can be very usefull in 389-console to have such
optional ability.