Drag/Add symbols without data items / blank symbols / emtpy symbols
Like in PI ProcessBook you could add an empty Trend, copy-paste many times, to start a dashboard, we need the ability to add empty trends to a display, to then populate it with attributes.
With the extensibility feature, it often doesn't make sense to first select an attribute before you can actually drag and drop, or add a symbol to a display. Think of a web page viewer, where the selected attribute is irrelevant.
You should be able to drap and drop a symbol straight-away, and not have to select an Element or Attribute or Tag first. It would just add the empty symbol, that could then be filled afterwards.
or drag and drop a point from one display onto another display. Even in a different processbook instance.