I have just implemented the display of appropriate messages on the status bar while the user creates entities. This has to be done giving suitable messages for other events too.
The messages can be given as a tool tip to the user too. This is to be discussed.
Also the statusbar has been divided into two parts in order to show mouse position and message both together at a time. By default, only one message can be displayed on the statusbar using showMessage().
I have created two labels and added them as widgets to the status bar using addPermanentWidget(*widgetName). This implementation is another step to make eCAD friendly to the user.