Include preset control points for different lens types for example Rectilinear (normal), Panoramic, Fisheye Thoby, Circular Fisheye, Fullframe Fisheye, Orthographic, Stereographic, Equisolid and more
for these you need data such as focal length and HFOV as well as focal length multipliers which the average user wouldn't have a clue how to calculae or find out.