A couple of suggestions:
- to keep the same angle and viewing position between Perspective and Volume when swapping from one to the other. This would be really helpful when trying to analyse the cave in 3D.
- to have an extra 3D navigation feature/tool on top of mouse navigation... I'm think of something similar to the 3D navigation features found in Fusion 360: it's a cube and when clicking on the faces, edges or corners, the view change the view angle to a predefined angle.