Upon looking at the code in evdev, it's clear the third button emulation
is completely non-functional for multitouch devices.

The emulation is triggered by calling Evdev3BEmuFilterEvent() from
EvdevPostQueuedEvents() in evdev.c.  This is done for events of type
EV_QUEUE_BTN only.  With a multitouch touchscreen, events of this type
aren't generated.  Instead, the events are EV_QUEUE_TOUCH, which will
never trigger the 3BEmu code.

These touch events don't work the same way as button events, so it's not
a simple matter of passing them to Evdev3BEmuFilterEvent() too.

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https://bugs.launchpad.net/bugs/1084938

Title:
  evdev settings doesn't work at all

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