The advantage of xinput over xorg config files is that it can be used on the fly to configure the trackpad, so each user can have their own configuration script at login.
First you will need to install xinput, if you do not have it already.
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# apt-get update
# apt-get install xinput
Next, find out the name of your trackpad device.
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$ xinput --list
Which will produce a list similar to
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⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=12 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ BisonCam, NB Pro id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
You can then find which properties of the trackpad that can be set with
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$ xinput --list-props 'SynPS/2 Synaptics TouchPad'
Adjust the name of the device to suit your hardware. This will produce a list similar to
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Device 'SynPS/2 Synaptics TouchPad':
Device Enabled (119): 1
Coordinate Transformation Matrix (121): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (238): 1
Device Accel Constant Deceleration (239): 2.500000
Device Accel Adaptive Deceleration (240): 1.000000
Device Accel Velocity Scaling (241): 12.500000
Synaptics Edges (242): 1752, 5192, 1620, 4236
Synaptics Finger (243): 24, 29, 255
Synaptics Tap Time (244): 180
Synaptics Tap Move (245): 221
Synaptics Tap Durations (246): 180, 180, 100
Synaptics Tap FastTap (247): 0
Synaptics Middle Button Timeout (248): 75
Synaptics Two-Finger Pressure (249): 10
Synaptics Two-Finger Width (250): 8
Synaptics Scrolling Distance (251): 100, 100
Synaptics Edge Scrolling (252): 0, 0, 0
Synaptics Two-Finger Scrolling (253): 1, 1
Synaptics Move Speed (254): 1.000000, 1.750000, 0.039809, 40.000000
Synaptics Edge Motion Pressure (255): 29, 159
Synaptics Edge Motion Speed (256): 1, 401
Synaptics Edge Motion Always (257): 0
Synaptics Button Scrolling (258): 1, 1
Synaptics Button Scrolling Repeat (259): 1, 1
Synaptics Button Scrolling Time (260): 100
Synaptics Off (261): 0
Synaptics Locked Drags (262): 0
Synaptics Locked Drags Timeout (263): 5000
Synaptics Tap Action (264): 0, 0, 0, 0, 1, 2, 3
Synaptics Click Action (265): 1, 1, 1
Synaptics Circular Scrolling (266): 0
Synaptics Circular Scrolling Distance (267): 0.100000
Synaptics Circular Scrolling Trigger (268): 0
Synaptics Circular Pad (269): 0
Synaptics Palm Detection (270): 0
Synaptics Palm Dimensions (271): 9, 199
Synaptics Coasting Speed (272): 20.000000, 50.000000
Synaptics Pressure Motion (273): 29, 159
Synaptics Pressure Motion Factor (274): 1.000000, 1.000000
Synaptics Grab Event Device (275): 1
Synaptics Gestures (276): 1
Synaptics Capabilities (277): 1, 0, 1, 0, 0, 1, 1
Synaptics Pad Resolution (278): 99, 69
Synaptics Area (279): 0, 0, 0, 0
Synaptics Noise Cancellation (280): 25, 25
Synaptics Jumpy Cursor Threshold (428): 110
To alter a setting use a command similar to
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$ xinput --set-prop 'SynPS/2 Synaptics TouchPad' "Synaptics Two-Finger Scrolling" 1 1
Finally, put the property setting commands that you desire in a script to run at login.

