I've played around with this, and the extension seems fairly restricted because you can't control the Order property.
Unless I'm missing something, it seems you can't move the loaded picture in front of or behind other objects.
You also can't control the visibility, which means you'll probably have to use tricks like moving it's X position out-of frame to hide it.
There's also no 'Follow the frame' option, which is a very useful feature of MMF2.
Any chance of a fix on these issues?
Personally I think this extension would be much more intuitive if it functioned as 'Load picture to active object 'A', animation 'B', directon '0', at frame '0'. However, I'm not sure if there are restrictions that prevent this.