I would recommend that the Users/Groups tab in the admin console not default to the Users Summary page, as this means that I am forced to wait for a user call to my LDAP each time I want to go to this tab. This is annoying especially when I’'m going there to do group work.
How about a default Users/Groups screen with “quick tasks” like creating a new user or group? Then, if I wanted to go to the Users Summary or the Groups Summary, I could choose to.
Choice is king!