There are hotkeys that help when using a Wacom or similar:
Pan Drag: J
Zoom Drag: U
Pan Move:
Zoom Move:
These are for the viewport though. There's not currently a hotkey to scroll the dopesheet vertically.
I am curious, how do you get by without a mouse wheel? Scrolling is one of the most common tasks (especially in a browser) and is very tedious with a pen. Personally I use a Kensington Export Mouse, which is actually a trackball. The ball is large and comfortable and the device is much better for your wrists than a mouse. The genius thing about it though is the ring around the ball rotates
it's a scroll wheel.
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