xinput is the tool for the job here on linux, although it makes global modifications which you may not want. `xinput list` lists devices, use `xinput list-props <device>` to list the properties of your trackpoint. you'll find one of the properties is scroll-wheel emulation. you can turn it off with `xinput set-prop <device> <prop> <val>`. device and prop can be number or name, and `0` suffices to set a boolean to false.
--
This is obviously some strange usage of the
word "simple" that I was previously unaware of.