Inventor has the "Constrained Orbit" command that allows you to orbit around a model while always keeping it upright. For those who use a 3D mouse, it would be great to have an option to lock the model upright even when orbiting with a 3D mouse (such as the 3DConnexion SpaceMouse) instead.
This would make orbiting with a 3D mouse easier, and also result in a better-looking model orientation when creating isometric Drawing Views and taking screenshots.