Make it possible to copy-paste in a way that results in copies having links to the original objects already added (using 'link to' option). It could be using command+shift+v or a different keyboard shortcut. Bulk action would do wonders here.
When we prioritize ideas based on a larger study we often lose the connection or would need to insert links manually, which is impossible when having a huge amount of cards / stickies. It would be very helpful to just click a link to see where the idea came from.