Feature request: Copy nodes by dragging & dropping while holding Ctrl

When I drag & drop a node and while holing the Ctrl key on the keyboard, the mouse pointer changes to a "not allowed" sign. What should that sign tell me?

If there is no function behind this yet, could you please let me copy the node(s) by doing so?

Seconded:

http://tech.knime.org/node/40796/view

The copy option is sometimes difficult. I try to copy holding the ctrl but I get weird result. The items get copied again and again. broadcasting