Have the ScrollViewer take into account the Delta value when responding to mousewheel events

At the moment, the WPF ScrollViewer always scrolls a fixed amount in response to mouse wheel events despite MouseWheelEventArgs returning the Delta value (The value that Windows sends as part of mouse wheel scrolling messages that determines how fast content should scroll.) Because of this, scrolling with precision scrolling devices such as touchpads scrolls ridiculously fast, making scrolling with devices like touchpads pretty much useless.
If the ScrollViewer could respond properly to the MouseWheelEventArgs.Delta value (i.e. scroll an appropriate amount depending on the delta value, which is just an integer), this would make scrolling in WPF so much better and greatly improve the user experience.