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.
O. Saukh, D. Hasenfratz, und L. Thiele. Proceedings of the 14th International Conference on Information Processing in Sensor Networks, Seite 274--285. ACM, (2015)
S. Henzgen, und E. Hüllermeier. Machine Learning and Knowledge Discovery in Databases, Volume 9285 von Lecture Notes in Computer Science, Springer International Publishing, (2015)