It's a useful plugin, but currently it miss some important functionalities.
Currently the image is loading in an unexpected position. In the layout editor the object has a centered hotspot, but in runtime the image has a top-left hotspot staying offset by half width and half height. It would be nice if you could choose the hotspot position in the properties panel like the Tiledbackground object, at least for the most relevant positions like top-left and center.
It would also be handy to have an "on image loaded" condition to trigger events when the image finished downloading and is displaying. And a "get image url" expression would also be very handy.
I suggest you to add a "set width" and "set weight" action, as well as a "get image width" and "get image weight" expressions to be able to proper control how an image is displayed. It would also be extremely important to have a "set position" action, as well as a "get X position" and "get Y position" expressions. It also misses basic actions for any visual plugin like "set opacity", "set visibility", and Z ordering actions.
Now I'm thinking that maybe it would be easier to mod a Tiledbackground plugin and add the load image from url functionality since all the other stuff are already in there.
I'm really interested in this plugin, hope you can make it more complete.