I agree that Design Option Mapping might be wonderful but I don't want to muddy the waters with that issue here. We usually just want to do something small like show a door in a different position from the architect and we don't want to bother the architect (yet) with a coordination request. It's such a common need that we tend to do DD drawings in AUTOCAD (horrors) because it's so difficult to manipulate the AOR model. A truly infuriating fee bleed in my opinion. It's probably Revit's biggest limitation for interior designers. Better hide-in-view capability (either in the editor or the API) would do us interior designers huge favor.
As a side note, I'd ask all ID people to speak up about this. All the other consultant get lots of special tools to do what they do...and interiors, we're just lumped in with the architects as if we do exactly the same thing in exactly the same way. Everyone in the AEC community and our clients would benefit if our workflow was smoothed.
James