This is something I'll definitely consider implementing. Image points are great if you want to have a character hold a gun in their hand or something while having an animation of them holding nothing. But it means if you have a running animation where the character swings his arms about that the gun always stays at the same direction. By having image points, it would be possible to make the gun rotate accordingly so it suits the animation. Also you could easy make reload animations.
I just need to see how much it would affect existing objects as it would require changes to the structure of image points.