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Possibly useful

Disable mouse acceleration on Synaptics Precision Touchpad

If you're lucky, the same registry fix as non-Synaptics touchpads works:

In HKCU\Software\Microsoft\Windows\CurrentVersion\PrecisionTouchPad set HonorMouseAccelSetting (dword, should already exist) to 1. Then reboot.

If you're not so lucky, you'll need the MarkC mouse fix. Mirror here:

Installation is self-explanatory - install the .reg matching your screen DPI.

After a reboot, acceleration will be gone. However there is some unavoidable input lag from this approach, as it is effectively inverting the acceleration.

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