AFAIK, no there's not. What kind of interface are you looking for ?
Woah this one slipped my fingers...
I think it would look like QTabWidget with only QToolbars as its children, each toolbar being 1 other widget. But with difference that that the QTab"ToolBar" would be a toolbar so I could place it like toolbar widget... ?
Perhaps I will need to somehow extend QToolbar with QTabBar and somehow make it work mhmm