Camera Paths for Animation (Replace Camera with Model or Group)
Since newGLB exports handle that in the hierarchy by default, it seems like it would be fairly easy (hopefully) to just have a button that let you attach an object (group, model, etc) to the path instead of the camera. Basically record the position, but the object moves along the timeline instead of the video camera.
The result should be able to import into blender or unity as an animation path.
Maybe change the camera icons color so it shows this represents an object instead while setting up the path.
While this wouldn't do complex animation like figures, it would allow simple objects to be moved around easily in the scene with fairly precise control.