For a more comprehensive exploration and walkthrough of the model it should be made possible to toggle gravity on/off so that we can either walk on model elements (slabs, stairs, ramps, roofs...) or fly through the model. This is a standard feature in other software like Enscape, toggling with the key "G", and should be easy and simple to implement in Revit perspective view.
In the case when gravity is "on" then collision with model elements should also be "on".
In case when gravity is "off" collision with model elements should also be "off".