This works for me, however, instead of looking for the device `TPPS/2 Elan Trackpoint`, I had to use the id of `TrackPoint Keyboard 2`. The downside of this fix is that pasting with the middle button does not work anymore.
N. Koeppen, K. Polkehn, und H. Wandke. Measuring Behavior 2002, 4th International Cofnerence on
Methods and Techniques in Behavioral Research, 27-30 August 2002, Amsterdam, (2002)
S. Simoff. Proceedings of the MDKM/KDD2000 Workshop on
Multimedia Data Mining, Seite 104--109. www.cs.ualberta.ca/~zaiane/mdm\_kdd2000/mdm00-15.pdf, (2000)