If you select the "Wheel" tab in Control Panel - Mouse, it is set to
3 lines for each wheel "notch" by default. By reducing the value to
1, you can gain a finer control of 2 finger vertical scrolling with the touchpad.

You could do the same for horizontal scrolling, but I prefer the default 3 lines.
In the "Pointer Options" tab, I have increased the pointer speed to the maximum "Fast" value to cover more real estate quickly.

I have the Sentelic touchpad running the 9.1.7.7 driver. I suspect this will work for other Sentelic (and perhaps Synaptic) drivers.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT