Fixing Synaptics right-click button

Tonight I finally got around to fixing my trackpad.  Again.

So here's the thing: like most Windows-based laptops, my little Lenovo ultrabook has a trackpad with two "button" regions at the bottom.  They're not separate physical buttons, but they act as the left- and right-click buttons.  However, rather than force you to use the right-click pseudo-button, the Synaptics software the comes with the laptop lets you turn off the right-click button and use two-finger-click as the right-click, a la a MacBook Pro.  I find this preferable, in particular because my laptop centers the trackpad under the space bar, rather than in the actual physical center of the unit, which means that when you're right-handed, it's easy to accidentally hit the right-click button when you didn't mean to.

Prior to upgrading to Windows 10, I had this all set up and it was fine.  After the upgrade, not so much.  Sure, the same options were still there, but the problem was the that option to turn off the right-click button did just that - it turned it completely off!  So rather than clicking in that region doing a standard left-click, that part of the trackpad was just dead, which was even worse than the problem I was trying to fix.

Luckily, it turns out that the functionality is still there - the Synaptics people just need some better UX.  I found the solution in this forum thread on Lenovo's site.  It turns out you can just change the value of the registry key HKEY_CURRENT_USER\Software\Synaptics\SynTP\TouchPadPS2\ExButton4Action to 1, which is apparently the standard left-click action.  By default, it's 2, but when you turn off the "Enable Secondary Corner Click" (i.e. right-click to open context menu) feature in the Synaptics UI, that gets changed to 0, which is apparently the "do nothing" action.

Long story short: my mouse is much better now.

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