Currently, in Camtasia, one can add 'objects' only to a track, which is a very good thing of course. The 'freehand drawing with pen' is only available in recording mode. I would be a good thing if it were possible in the editor mode. It would not be dynamic, of course, which would be way to difficult. A simple static overlay of the bitmap one draws, with a certain duration, and the possibility to move, delete, resize... In fact 'paint' on top of the visible tracks.