Since 1.4-M4, you can choose to switch User Manager Implementations you are using dynamically.
LDAP configuration can now be done via an UI and it's now dynamic (no more need of using vi to edit a file :-) ) and no more need of restarting.
You can test your ldap configuration too.
You can now too modify some Redback configuration properties. You have a help button which explains to you what the property is doing.