Disabling One-Finger Tap-to-Click But Keep Two-Finger tap Ubuntu 12.04

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http://askubuntu.com – The option to disable the touchpad while typing does not work on my Samsung RC512 with an Elantech touchpad and I enjoy two-finger scroll and middle-click emulation with two fingers too much to disable tapping the touchpad. When I type the cursor will jump around because I'll hit the touchpad with my palm. How can I disable one-finger tapping but keep multi-finger tapping? (HowTos)