This python script allow to synchronize node's changed value to selected nodes. Once you enter purple mode, knob value you change is copied to selected same node.
Sync knob value
Updated: 21 January 2016
Author: hslth
Compatible Nuke versions: 7.0 or later
Compatibility: Linux, Mac, Windows
add menu
import nuke
import knobChange
knobMenu = nuke.menu('Nuke').addMenu('KNOB_CHANGE')
knobMenu.addCommand('Knob Change', 'knobChange.changeAll()', 'f8')
The script use knobChanged callback.
I use this script's hotkey as F8 so please change it as your flavor.