So two finger scrolling is also broken. Ugh.
Synaptics really needs to up their game on their drivers, if they're going to post a blog post boasting about their 'collaboration' with Microsoft on 8.1. I think it was only in late November that Synaptics posted drivers for Windows 8. Prior to that, any Metro app which wasn't written in HTML and JS (running in WWAHost.exe) would simply not scroll with the touchpad.
Yeah, I've never had good touchpad experience in windows, period. Its actually one of the reasons I first started using linux on my laptops. Touchpad drivers for windows have always been horifically buggy, and windows basically has no native touchpad support (last time I checked it just treats them like a generic ps/2 mouse out of the box), so its all down to these aforementioned crappy drivers. I have one laptop with a synaptics touchpad and one with an elantech touchpad, and both have horribly buggy two finger scrolling in windows no matter what driver I use.
Actually I've had a much more frustrating experience with the touchpad on Ubuntu
I can't get my touchpad to be less sensitive, I can't change how much finger pressure I need to perform a click, etc. Touchpad works fine if I'm running Ubuntu in a VM.
Should also mention, in Windows 8 the default PS/2 driver does actually support scrolling for touchpads. Anything fancier than that, then yeah drivers are needed.