WinExtras: Create tabs with custom thumbnail image

The first release of QtWinExtras is cool! I am using it in my AudioPlayer. But I think some features are missing.

Is there is a way to create a custom image in thumbnail? Moreover, is it possible to create multiple "tabs" in the preview area?

It could be great if you could create this . I know it is possible because one guy has made it (here : http://nicug.blogspot.fr/2011/03/windows-7-taskbar-extensions-in-qt_24.html) but it's not in Qt's way!