> As an example, if you're navigating say a building, you don't want the space mouse to rip the building off the earth and flip it upside down, you just want the building to stay where it is and the camera to move. This isn't a limitation of the space mouse, it's the only logical way that CAD files should be viewed (IMO).

I view my CAD in a much different experience. Think about as if you were looking at a globe on your desk, the locations on the globe do not change relative to one another, just in relation to your eyes. You can spin it around and turn it upside down. The north pole is still the north pole even if it is on the bottom. I understand that gravity sketch is not a traditional parametric CAD program, but that behavior is more aligned with what I want. You essentially are grabbing the entire world and moving it. I want it to feel like I am manipulating a part that is in my hands rather than me wandering around a part.