trackpoint dell d630/d620 xorg.conf settings

/etc/X11/xorg.conf.d/99-dualpoint.conf
Section "InputClass"
    Identifier  "TrackPoint Clone Acceleration and Middle Click Emulation"
    MatchProduct    "DualPoint Stick"
    MatchDevicePath "/dev/input/event*"
    Option      "Emulate3Buttons"   "true"
    Option      "AccelerationProfile"   "7"
    Option      "AdaptiveDeceleration"  "1.3"
    Option      "ConstantDeceleration"  "1"
    Option      "ExpectedRate"      "10"
EndSection

Section "InputClass"
        Identifier      "TrackPad Clone Acceleration"
        MatchProduct    "AlpsPS/2 ALPS DualPoint TouchPad"
        MatchDevicePath "/dev/input/event*"
        Option          "AccelerationProfile"   "1"
        Option          "AdaptiveDeceleration"  "1.3"
        Option          "ConstantDeceleration"  "2.5"
        Option          "ExpectedRate"          "120"
EndSection