Thinkpad keyboard & scrolling
I do not own this keyboard, so I can only cite others.

In this Topic some users talk about their experience. It seems to depend on the exact version of the keyboard, that you are using.


USB-Version:


  I was able to get the center mouse button scroll to work by installing USB Overdrive. You select "middle button" and change it to "move to scroll"

Bluetooth-Version:


  My Lenovo Compact Bluetooth wireless keyboard (Part Number# 0B47190) paired via bluetooth with both my MacBooks quickly, and the middle button used with the red trackpoint on the keyboard scrolls in every situation I can think of (web browsing, doc editing, evernote, MSOffice, Keynote, Pages, etc.) without any addition setup or extra programs like UsbOverdrive.  It just works.