It isn't necessarily about difficultly - have a duplicate selection option is actually fairly common.
@Steve-Mcl I think the subtle difference here is how wires that join a selected node to an unselected node are handled.
If you have an Inject + Debug node wired together. If you select both, copy and paste, you get a new pair of nodes that are wired together.
If you select just the Debug node and copy/paste - you get a copy of the Debug node but it is not wired to the Inject node.
The proposal here, I believe, is to have an action that will duplicate the Debug node, as well as the wire to the Inject node.
Adding a Duplicate Selection action will be simple to do - its between 1 and 3 lines of code depending how verbose I chose to write it.
Adding a Duplicate With Wires action will be a bit more work, including coming up with the right name. It needs to have a sensible name that makes it clear what it does.... suggestions on a postcard please.