As asked by an Italian friend that posted a review on his blog (link). I’ve implemented Drag&Drop decoding support for QR Codes images directly from a website in QtQR.
You can see this in action in the following video:
You can expect this feature to be available in the daily PPA or wait for the stable release.
EDIT: Just if you don’t know, you can drag&drop to a QtQR dekstop launcher like showed in the next video, in this manner you don’t even have to open QtQR previusly to decode a file.
Any thoughts, bugs or feature request are more than welcome!