7:46:42polygon-opmaxz: I don't think that there is such command. if you want to select a rectangle, then you may define-drag-and-drop-translator (and translate to a rectangle, or a command that accepts this rectangle), or you could accept two blank-area objects (returned objects are pointer events)
7:47:12polygon-opor use somewhat lower levels of abstraction (tracking-pointer could do the job, alternatively dragging-output etc)
8:15:56polygon-opdnd-translator should have src type and dst-type as blank-area if it is to be "anywhere"