we're using the intranet on our server as well, and we've found this topic to be a bit confusing as well. it seems that aD kinda did exactly what they said they did; they needed an intranet and hacked something up that basically looks and works just as they want it to. unfortunately, it doesn't seem like they worked all the kinks out and documented everything very clearly.
i think, though, that it's a great beginning. if the docs you're talking about don't exist, then i would be really interested in helping build them. also, i'd like to see and help an effort to really improving this module, based on how it comes out in 4.0 of course.
talli