Sometimes you want to move nodes only one axis, to keep horizontal/vertical connectionpipes aligned.

# MoveNodes 1.0
# Moves selected Nodes up,down, left or right.
# Usage:
# > select node(s) and press Shift+Up to move Up, Shift+Down, to Move Down, and Shift+Left/Shift+Right to move selected node(s) left or right.
# > The selected Node(s) will be moved by your "dag_snap_threshold" value in your preferences.
# Installation:
# > save the script in your Nuke Plugin path
# > and add the following line to your menu.py
# > nuke.load('X:/----path----/-to-/-plugin-/MoveNodes.py')
# > don't forget to setup the custom menu_name, see line 15
#
# scripted by Marc Gutowski
# website:    www.ewok1.com
# last update 03.04.2011 / v1.0 (release)