.... to have the abilty to do a preliminary fly through that for example allowed you to lock the gimbal, not just on a gps coordinate , but also at the specific elevation and at specified gimbal orientation, sort of like a 3D waypoint....
That's already possible. It's simply called a "point of interest (POI)" in Litchi and you select not only the POI but at what angle/altitude you want the camera to be pointed. Also for multiple POIs/Waypoints the software will interpolate from one to the next and make a smooth transition for you.