For me the TrackPoint works with evdev, no additional drivers required, I can even configure acceleration and sensitivity through the XFCE pointer GUI as usual. Maybe you were hit by the kernel bug that makes the TrackPoint devices only appear several minutes after boot? I can say that on 4.5.0-2-amd64, it worked fine with no configuration through xorg.conf. The Arch Linux wiki has some details about configuring, though: https://wiki.archlinux.org/index.php/TrackPoint