If the user wants to delete several points and items and newly loaded the pattern file, the back button is not functional any more. Now she/he has to look into the chronic/log to see the last actions, as older actions with dependencies are not deletable. It is possible to select the last action (very good!) in the log, but to delete the object, the user has to move the mouse, activate the main window and select the object again to delete it. It would be better if the user could delete the last object directly in the log list. Left mouse Button=select; right mouse button=delete
So deletion of several objects would be much faster.