It is difficult to create LDAP groups, because of bureaucracy (in my firm I should write a lot of mails an so on... to set some LDAP groups in Microsoft AD).
I want to set readers, authors and sysops groups, and synchronizing these with User Names come from AD.
How can I do this? Please help me!
I'm not sure what you are asking...
Are you asking how to sync MediaWiki groups with groups in AD via the LDAP Authentication plugin, or are you asking how you can add users to MediaWiki groups without creating AD groups?
V/r,
Ryan Lane