Re 2nd question: I have experience with QV plug-ins and MS SMS. No reason why it should not work with SCCM.
Re 1st question : There were some teething problems with QV 8.0 to support properly AD (LDAP) authentication, fixed since then though.
All script commands regarding NTNAME and NTDOMAINSID are decribed in QV manual. Basically QV pulls all info from AD controller.