Apple - How to increase "tracking speed" beyond the maximum?

The value of the preference is stored in ~/Library/Preferences/.GlobalPreferences.plist and can be changed with something like defaults write -g com.apple.trackpad.scaling -float 5.0. The normal maximum value is currently 3.0. Applying the changes requires logging out and back in.

For those who come here searching for mouse speed up (as me), change the command/property mentioned on the answer of @user495470 to com.apple.mouse.scaling.

So:

defaults write -g com.apple.mouse.scaling -float 5.0

is what you're looking for.

Here is @Kodos Johnson :)

BetterTouchTool does that, and lets you add application specific gestures as well!

I don't think I could use a mac without it, at this point. I have my browser-tab-management and finder shortcuts mapped to multitouch gestures.