It looks like those are the default settings for the synaptics Xorg
driver (xf86-input-synaptics upstream or xserver-xorg-input-synaptics in
Ubuntu). In the latest version of xf86-input-synaptics (1.50),
src/synaptics.c contains the following lines:

pars->tap_time = xf86SetIntOption(opts, "MaxTapTime", 180);

and

pars->fast_taps = xf86SetBoolOption(opts, "FastTaps", FALSE);

which as said before, seem to be the culprit of this problem. A simple
patch to change those values in the source code would fix this problem.

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https://bugs.launchpad.net/bugs/859474

Title:
  Dragging with touchpad unusable

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