Interactive objects creation with cursor orientation

In edit mode, there is a tool called "Add Cube" which just, like the name suggests, adds a cube with the orientation of the 3d Cursor. It also creates it by dragging the mouse, defining this way it size and position. What I would like is to be able to create all objects this way, in both Object Mode and Edit Mode. Then, if this is implemented, maybe that "Add Cube" button should be removed, as you would able to create a box the same way with the object creation menu. I think this should be very easy to implemente and more useful, as it is already implemented on that button.