Thinkpad W500 two-finger-scrollable touchpad

So this beautiful 1900x1200-resolution machine, the last of it's kind I believe, can get pretty stubborn with its touchpad.  The official Synaptics ultraNAV driver from Lenovo doesn't offer this highly-productive feature for this model (maybe too old/discontinued).  Slapping on a Linux distribution doesn't help either (Ubuntu's 12.04 and 16.04 attempts only).

Also the last of it's kind.  The knob-textured upgrade of the W510+ would wear away; throwing the touchpad sensitivity out of whack. This baby, by contrast, lives forever.