I've been using Enscape over the past year to do presentations with a client and one major issue that I've faced is that there is no ability to prevent movement around the model in Fly Mode. Our client likes to move around using that method and in doing so finds parts of our model that are less desirable to show. I would find it extremely useful to have the ability to toggle on and off an invisible 3D boundary that would limit the area of movement in fly mode. Similar to the way that video games restrict your movement at the edges of the map.
I think creating a boundary parameter that could be added to a material would be a great fix for this.