Yes PLEASE. I thought I had I requested this at one point too, but it might have only been in my head! Yes…copy component with option to copy to top or bottom of current list.
Here’s how this would be even better: 
ability to right click a component from the list 
and select “insert new component above”, “insert new component below” or “duplicate component” in which case it would insert a clone below the right-clicked component. This would be a massive time saver for sure!