Tried -noforceparms on Steam version, didn't work. Tried running ver. 1.55 on Xash3D with -noforcemparms, no success. Tried RInput, this bugs out the mouse location with in-game GUI's, which makes them nearly unusable in both the Xash3D port and Steam version. Decided to go a bit more extreme and disable windows mouse acceleration with the MarkC registry tool, success. I suppose if all else fails, the MarkC tool might work for you.