Apple tends to not build a GUI for some of the more esoteric or rarely desired settings. Try this from Terminal for mouse and track pad respectively:
defaults write .GlobalPreferences com.apple.mouse.scaling -1 defaults write .GlobalPreferences com.apple.trackpad.scaling -1It'll stick unless you otherwise change your mouse settings again. Explore "defaults write" some more, because you can do some pretty crazy fine-tuning and customization of the system with it. In Windows the equivalent would be hacking the registry to customize things you can't do through the GUI.
Have you tried it? It wears my wrist out with those settings. Precise, but tiring.