T440s TouchPad - Tap and Drag - Where is the "locking drags" setting?

Question

On my ThinkPad X220 TouchPad properties there is a Tap & Drap setting for Locking Drags (see below). When this is enabled you can tap twice on an item (and hold on second tap) to engage drag and then this will be locked until you tap again. The benefit of this is it is possible to use multiple discrete touchpad movements to move an item across the desktop without having to engage drag mode each time. 
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This feature is not specific to my X220. I find it on lots of laptops and I find it extremely useful.
However, on my T440s I can't find such a setting. Am I missing something?
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Answer 1

I was looking for this setting too. It's extremely helpful when you need to select text. After googling around and finding little to no information I figured it out on my own. I grabbed my old laptop and compared the registry before and after checking the "locking drags" setting. All what you need to do is find the key:
HKU\S-1-5-21-*a-bunch-of-numbers*-1001\Software\Synaptics\SynTP\TouchPadPS2TM2668,
and change the value of "Gestures" from 3 to 7. There is another similar key named TouchPadSMB2cTM2668. I was lazy to find out what key will affect the setting so I changed the valuge of "Gestures" too. After that log out / log in again or restart. It works perfectly for me.
Hope this helps.