After reading Trevor's thread on schema, there's a core issue here:

How does one go about choosing between RFC2307 and RFC2307bis? (They are incompatible: You can't have both.)

Is it RedHat's position to mandate the use of RFC2307 and remove RFC2307bis as a supported option?

(In other words, if you want RFC2307bis, you're on your own, and you'll have to deal with the possibility that any changes you make to core schema might be subsequently undone by updates to 389-ds.)

Anthony