With kernel 4.8.11 or 4.9.0rc7 the trackpoint still behave weirdly.

a) its sensitivity is too high, small nudge moves the screen all around the
display

-> maybe reducing default speed reported by the device could be enough

b) trackpoint buttons sometimes on press report doubleclick on the machine, ie
instead of moving cursor in app you mark the text/word

-> discussed with jikos and the evtest reports the events correctly, so this
might be some libinput issue

c) trackpoint profile seems kinda linear, regardless of a pressure it moves too
quickly, either small nudge or full press make the same movement.

All of the above observable on Gnome in X and Wayland