This script is easy to move pivot to center or vertex point.

/PivToVertex(PolygonOnly)
:This script is model center/pivot move to snap to vertex point.
How to use
1:Select vertex point
2:Push the button

/ParCenterToChildCenter
:This script is parents model/locator/group move to snap to parents child center.
How to use
1:Select child
2:Push the button

/ParCenterInvertChildCenter
:This script is child thing invert parent thing.
How to use
1:Select child
2:Push the button

/ChildCenterToParCenter
:This script is parents move to snap to child center.
How to use
1:Select child
2:Push the button

/CreatGrpToSelCenter
:This script is group moves to selected center when you select things to run.
How to use
1:Select things
2:Push the button

/FreezeTransform
:This script is freeze transform,rotation and scall.
How to use
1:Select things
2:Push the button

Update:
v1.0.0 -  Release. 

v1.1.0 -  Add two commands. 

v2.0.0 - Renewal

     
Install:     
Copy python to \Documents\maya\2012(or 2011 or ....)-x64(or x32)\scripts
Command:
reload(SC_MoveCenter)
import SC_MoveCenter    
      
     
For bugs and suggestions,please contact me-> animationryukyu@gmail.com  
Thanks!!      
Hope you will enjoy it