I will seriously consider pulling Annex D into the main document.  It makes my life a bit easier, too.  However, I suppose it's worth noting which version of H.323 an Annex will work with in general.  I have had similar inquiries about Annex E and Annex F.  Perhaps a new section in the Implementers Guide is in order to address those issues?
I think that it should be in the summary of the Recommendation, if we pusblish it separatly. Not everybody reads the implementor's guide (although they should). That is what we have done for H.323 to relate it to different versions of H.225.0 and H.245.