I can confirm 3-finger tap-to-click does not work, even with the MT Grab
Handles plugin disabled in ccsm. But this is not a bug in the PPA and I
did only intend to fix actual clicking with clickpads for now.

>From memory, the reason for this is that unity unconditionally captures
all 3-finger touch events. And the only way I know of preventing this is
to hack the unity code (last time I checked about 9 months ago). This is
why my fix works with clickpads and not touchpads (or tap to click).
Because a 3-finger click on a clickpad is a physical button event that
happens after a 3-finger touch, so it's easy to handle the button event
even while unity is already handling the touch event that happened
before it.

I think a fix in unity itself is required to support touchpads or tap-
to-click. It probably makes no sense that unity should still be
capturing all 3-finger touches even when the MT Grab Handles plugin is
disabled.

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https://bugs.launchpad.net/bugs/754000

Title:
  Running Unity disables Xorg's 3-finger click support (middle click)

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