Just registered here in order to rate this very useful extension and propose a feature.

I use it with a Thinkpad X200T convertible (stylus screen, no touch). I use the experimental left click option and it performs quite well. The only problem is just that when the cursor is not completely stopped while clicking on buttons inside websites (which are not text fields), the extension interprets the click as the beginning of a scrolling gesture and clicking fails. I have two proposals to tackle this problem:

1. An easy option to switch the extension on and off (a switch directly in the context menu of the extension's icon in Firefox's toolbar). I only use it in the tablet mode so I would like to switch it off in laptop mode.
2. An (adjustable) threshold of a minimum cursor speed which leads to the beginning of a scroll gesture. If the cursor is not fast enough, the mouse down event should be considered a click, not the beginning of a scrolling gesture.

But other than this minor problem the extension works very well!