Is it possible or difficult to add a new function: set the dockwidget title bar vertically to the left side of the dockwidget.

[qhtian]

With QDockWidget it is possible to set the title bar to DockWidgetVerticalTitleBar, which will put the title bar vetical and to the left side of the dockwidget. In the ads->DockWidget.h, the definitation of enum DockWidgetFeature simply does not contain DockWidgetVerticalTitleBar.
Personally, I think this feature will save some vertical space in the mainwindow, especially when people have many dockwidgets on one side.

Question or requst:
Is it possible to set this with Stylesheet?
If not, can this feature be included in the future version?
I personally can only use this libary, unfortunately, my capability disallows me to contritubte to the code.