Rules that are really long are cumbersome to work with — you have to scroll all the way down to your component, click on it, and then scroll all the way back up. For rules with lots of components, this is almost untenable.
Potential solutions are:
Fixing the config panel to the window while the component list scrolls
Scrolling the two panels separately
Jumping to the top of the page when a component is selected
Ability to collapse long rule branches in the side bar