Anyone with a MacBook or MacBook Pro can scroll by using two fingers on the trackpad. I haven't seen this implemented on a PC laptop under any version of Windows.
Is it possible, and if not, how come?
If it is, someone write the driver!
P.S. Yes, I know about scrolling with the edge of the trackpad.
Most trackpads only report a single position.
2 Finger scrolling needs to report 2 positions, and thus, requires the trackpad to be designed in a physically different manner.
I believe the MBP trackpad support multi-touch, while most laptop trackpads do not. This means that it's not just a matter of updating the driver, but the hardware itself has to support it!
For what it's worth, I can use two finger scrolling when I remote into my PC from my MacBook.
I have a couple obscure laptops (Nobilis) a whitebox brand of some sort, which do have a two-finger scroll option in the driver. It is a Synaptics driver, so I would think they are made by Synaptics or at least specified by them. Unfortunately, these are all sales laptops so I don't have any in house that I can give you the version info from, but I'll edit when I do.
I haven't seen that option on any other laptop, but it does work on these few. So it's obviously possible. That said, using 2 finger scroll on a touchpad that's only 1.75" high and inset almost 1/8" into the housing of the laptop is a very different experience from the 3x4" flush trackpad on the MacBook Pro.
Instead of two fingers, most PC laptops allow you scroll with one finger using the right edge of the touchpad.
I know that's in your question, but I wanted to make sure someone saw it in an answer, as well. Six of one, half dozen of the other.