Is it possible to set the magic trackpad options with the menu topics:
- Point click,
- scroll & zoom,
by using the Terminal?
You can use defaults to edit property lists. But Magic Trackpads and laptop trackpads have different settings, and they are stored in different places in different versions of OS X.
Here's some commands from the .osx file by @MathiasBynens:
The first ones don't enable tap to click on the login screen in Mountain Lion.
You can diff the output of defaults read to find keys for preferences.
See also these questions: