Aside from the hotkeys listed in the lower right hand corner of each of the buttons on the bottom of the game, I have stumbled upon some really useful hotkeys that you may be interested in. I dunno if this works for all platforms as I play on the standalone flash program on a mac.
First is Previous Page and Next Page activated by Y and 6 respectively. This is useful when you accidentally skip through text you want to read and are (like me) too lazy to bring the mouse to the lower left corner of the screen to click the available buttons there.
The second accidental discovery is the ` or tilde key. It doesn't always seem to work, especially when I switch windows, but is is easily re-enabled by clicking on the Character Appearance icon in the lower left corner and then exiting that. The tilde key is an alternate way to scroll down text - working like page down does. it's really convenient since it's so close to where your left hand would normally be and is useful for... shall we say, one handed operation.
You can also hit the tab key and use the arrow keys to navigate the buttons on the left side of the screen.
Has anyone else found shortcuts like this? Are there shortcuts for the Next Button Page and Previous Button Page in the lower right corner?