In my company we are using Advance steel to detail ,but in multi-user environment.
The Approval status does get transfer between master model and slave model, and this is a big issue for us ,because we are always 3 or 4 people working in the job and is hard to keep track of the pieces status inside the model.
Please try to develop these feature more because is a powerful tool and because it keeps us from working in larger projects and can not gain speed in detailing because we have to use all kind of workarounds to make it work.