I realize that DSfW and IDM are two different beasts, however I am in a situation where I think I need both.

We initial created a IDM AD domain since we had systems/application that needed to run on AD.

However we do have a number of remote sites that have a significant number of people which we want to add to a domain. So rather than go through the nightmare that is partitioning and sub forests in Windows, I was thinking of using DSfW at the remote sites and creating a Forest Trust to the existing IDM Domain.

My question is:
Has this ever been done (and documented) or are there any white papers on the a similar case.