Affect Pivot and Center Pivot
This script contains an Affect Pivot - and a Center Pivot. It works similar to Maya's Affect Pivot. You need to assign it to a hotkey - or put it in a Quad Menu.
Once you have executed Affect Pivot - click anywhere you want the pivot point to be located. TIP: Works great with snaps. Center Pivot does just that. It also works with multiple selections.
unzip into your 3dsmax4uimacroscripts directory and restart max.
Open up the Customize>Cusomize User Interface. Click on the Category
dropdown list - and scroll down to MC Tools.