Change Trackpad Preferences Through the Terminal?

Hello. I have a MBP with a multi-touch trackpad (gesture support, 4 finger swipe, etc). I have found that in some applications I need to quickly change the settings of the trackpad. I have heard of the program MultiClutch, but that may be overkill for what I need.

Is there a terminal command to change the "tap to click" and "tap to secondary click" settings?

I have gotten this to work with Automator, but that's very slow as I have to use "Watch me Do." I suspect the settings are in the ".GlobalPrefernces plist" file, ('com.apple.trackpad.enableSecondaryClick OR com.apple.mouse.tapBehavior) but it's not obvious which I need to change, what the variable is or how I would do this. I've searched Google, MacOSX hints and the discussion boards and so far have not found anything specific enough. Anyone know if this is possible? Thanks.