Well managing the AD tree is what i’m trying to do right now.
First I need to be able to connect to LDAP. I’m trying with APACHE Directory studio (Welcome to Apache Directory Studio — Apache Directory) but until now i could not connect to it 
I miss the information required to connect to LDAP.
So, Ii can’t say for sure that you can manage the computers from SAMBA AD. One thing for sure is that you do not have GPOs like in SAMBA 4 yet
If anyoane has success with connecting to LDAP please share so we can make progress with this HOW-TO 
BR
Bogdan