Activate Scrolling with Middle Trackpad Button

i would like to share my solution how to activate the feature
to scroll by holding down the middle trackpad button and moving
the trackpoint up/down on a thinkpad (x41,i use x200, it also works) cause as i noticed all
postings relating to this issue refering to the xorg.conf,but as i
read in the ubuntuusers forum this function will now be handelt by hal

so here are the steps that worked for me finaly:

• cd /etc/hal/fdi/policy/
• touch mouse-wheel.fdi
• vim mouse-wheel.fdi
• press "i" to switch to insert mode
• copy & paste:
  Code:

  <?xml version="1.0" encoding="utf-8"?>
  <deviceinfo version="0.2">
   <device>
    <match key="info.product" string="TPPS/2 IBM TrackPoint">
     <merge key="input.x11_options.EmulateWheel" type="string">true</merge>
     <merge key="input.x11_options.EmulateWheelButton" type="string">2</merge>
     <merge key="input.x11_options.YAxisMapping" type="string">4 5</merge>
     <merge key="input.x11_options.XAxisMapping" type="string">6 7</merge>
    </match>
   </device>
  </deviceinfo>

• press esc to leave insert mode
• press "ZZ" to save & exit vim
• reboot system & enjoy scrolling