[*] At least until we have a Wine-specific mouse acceleration support but that's also another topic, and it's not even clear that we need or want one.
Please, don't ever implement this, it's a stupid feature and I think that 95% of the global population agree with me. There's just no reason why we would ever want this. Even $5 mouses doesn't have sensitivity issues nowadays, just no.
The session manager or DE should control this "feature", it would be just another layer.