I go into ccsm and make an output region that's 1920x2160 for the upper left quadrant, a 1920x2160 for the lower left quadrant, and a 1920x2160 for the upper right quadrant, then just use the compiz clone to clone the lower left quadrant into the upper right quadrant. Just Shift+WIN (super) click and drag on the lower left quad and drag up to the upper right.
I open my browser window and resize to fit and voila, I can see the upper left quad and lower left quad at the same time. Scrolling the webpage with the scroll wheel updates the clone as you'd expect.
The video drivers and compiz don't refresh the screen properly and it flickers sometimes, and there's some weird double/triple buffer jitter effects. It would be awesome if this were seamless.
It also helps to have a "regular" 1920x1080 monitor as your primary monitor on the left when you're messing around with additional screens.
So now you can view a double tall webpage in a "two page view".
A screenshot of the entire screen shows my regular 1920x1080 monitor area on the left, the left side 1920x4320 region and the upper right 1920x2160 region that is cloned from the lower half.
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