In computing's never-ending march to slowly render mad anyone who actually knows how to operate a computer, Lenovo has hidden the option to have the ThinkPad middle click button actually middle click – they think the world is better served with a crappy forced scroll option.

Here's how to repair this needless damage, courtesy of here:

• In regedit:
  • HKEY_CURRENT_USER\Software\Synaptics\SynTPEnh\UltraNavPS2 : TrackPointMode – change from 1214 to 2214 (hex)
  • HKEY_CURRENT_USER\Software\Synaptics\SynTP\StickPS2 : MiddleButtonAction – change from 0 to 4
• Reboot
• Don't mess with the UltraNav settings; they will silently re-ruin these settings

This registry file should automatically make the changes listed above.