beyondcanon.com, and homestuck2.com before it, has a very useful feature which allows using the keyboard's left and right arrow keys to navigate back and forth in the story. However, this feature is not always wanted, and a setting to disable it would be appreciated.
(secret motivation: I want to be able to use the arrow keys in a browser extension to do something other than go to the next page, and as it stands, there's some fighting over who gets to control what the arrow keys do.)