[CentOS] Migrating to IdM

I have just started looking through the RHEL6 IdM guide, and while the documentation seems quite thorough and extensive, the examples are somewhat on the weak side. Migration scenarios can be much more complex - e.g. migrating away from NIS while at the same time moving to LDAP or AD for user account management. Is anyone aware of any tutorials or guidelines for such a situation?

Then there are a number of technical questions that are unclear - are there equivalents for the standard yp* tools (enumeration via ldapsearch may be restricted by policy); can there be local (to the IdM server, not machine) users that are not in LDAP/AD; can there be local passwords for users; etc.etc. Should CentOS7 be considered over CentOS6?