That's cool. I hope Matts change gets merged soon. Then the issue becomes how do people find out about this capability? Expecting people to learn how to hand-craft Bitcoin links won't work. But all modern operating systems support copy/paste and drag/drop of rich content. Qt probably makes it easy to expose an UI like this:

   Pay me    [Copy to clipboard]

Clicking the link in the UI would pop up an alert saying something like

   "You can drag this link to an email, chat window or editing program."