In the users contextual tab, we could add a button named "See user's groups", that will display the groups of the current selected user.

Optionnaly, a button "Add user to a group" and "Remove user from group" could allow to quickly edit current user's groups.

This button would be really usefull to allow admin to test correctly the ldap configuration for their groups : since when you set both attributes in ldapgroupdirectory, you can have the group listing that works but not the opposite