This is the tabtabtab tool that Ben Dickson made (http://www.nukepedia.com/python-scripts/ui/tabtabtab/), with a few small changes to the code to make it work for Nuke 6.2. I tested it with Nuke 6.2v1 and it works. It may work for older versions too.
Imitates the behavior of the viewer in Flame, without affecting the behavior of the original Viewer. Tested in nuke 7, 8, 9 (Preferences inaccessible in 9)
Easy way of changing layer inside the viewer.
slider to scale nodedistance in X and Y
menu for creating merges and setting operation in one go
Save a node's knob values to "stores" and recall them at any time.
a better search and replace panel
show the default icons along with the required syntax for use in labels
a panel to convert between fov, aperture and focal length
A panel to keep track of tasks for a shot