At the moment, you have to move cursor to the empty frame on timeline to create new, or copy existing, frame. It will be useful the new frame to be created next to the selected one (or nearest empty slot) when you press 'New/Copy frame' buttons.
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See my comment on the other task, it'd be great if you first commented on the forums about this, or if you made a bugreport at bugs.kde.org. Not here.