QToolButton with QAction

It will be great to put into QToolButton (or all visual classes in Qt Designer) objects of QAction in design-time.
It will be faster to develop action-based applications.

For example:
Class QToolButton, QMenu, QMenuBar have slot setDefaultAction
( QAction * action ) (or addAction)
but only QToolBar have it's realization in QtDesigner (I can append
action to the toolbar's list of actions).
I expected to add action at design-time to all visual classes where it's
possible (QToolButton, QMenu, QMenuBar etc).