In the Sequence contextual menu, "Create New" actually duplicates the current pattern. Would love to see a context menu item and keyboard shortcut for creating a blank Sequence.
For now, that's possible via the treeview, but I guess it can as well be added to the orderlist ctx menu.
Please confirm that this has been implemented as wished in in OpenMPT 1.18.02.00 (http://forum.openmpt.org/index.php?topic=3951.0). You may close this thread yourself then (edit first post and set the status in the topic title to S=C).