This code was written by Frank Rueter and it is really useful. It allows you to paste whatever you have copied on several nodes at the same time. I have it on the hotkey alt+v.

Expand Paste to Selected
import nuke
def toggleSelection(node):
newValue = not node['selected'].value()
node['selected'].setValue(newValue)
def pasteToSelected():
if not nuke.selectedNodes():
nuke.nodePaste('%clipboard%')
return
selected = nuke.selectedNodes()
for node in selected:
if node.Class() == 'Viewer':
node['selected'].setValue(False)
selected2 = nuke.selectedNodes()
for node in selected2:
toggleSelection(node)
for node in selected2:
node['selected'].setValue(True)
nuke.nodePaste('%clipboard%')
node['selected'].setValue(False)
for node in selected2:
toggleSelection(node)
for node in nuke.allNodes():
node['selected'].setValue(False)