http://bugs.winehq.org/show_bug.cgi?id=15118
--- Comment #57 from voidcastr voidcastr@gmail.com 2012-10-02 16:49:10 CDT --- Addendum to comment #55:
I just noticed that the described behavior could also be observed before the patch (e.g. with 1.5.14 tag release), but the mouse speed threshold to trigger it is now significantly lower.