It will be useful but it will not cover al cases, specifically i have thousands and thousands icons and i dont know which one i am going to show, it all depends on the user playing. So, plain download manager for http:// urls as icon source would cover everything. What is the reason it is removed in your version of SDK? It used to work very reliably when i was building QML app using Qt 4.8.
Another workaround would be to feed binary data to Image somehow which i could get using xmlHttpRequest but in any case i am stuck.