Lewis,
I guess is has to do what HOW you use that Reference ID. I use it in a specific manner and have been adding the Reference
Numbers for many versions of
Family Tree Maker. They are available to me in version 2010 and I continue to use them for the same purpose.
The issue with the Automatic Reference Number, from previous versions of
Family Tree Maker is that they could change, be deleted, and/or duplicated. Manually overwriting them, as I have, worked then and still works.
The Individual Reference ID and Shared / Marriage Reference ID is a standard field in Version 2010 as well.
Russ