Ctrl-scroll a value, but exponentiallly

Ctrl-scrolling any value in Blender change it by 0.1 (or 0.01 in some places, not sure about the logic behind this) which is a very handy little feature, but sometimes you want it to change it's value exponentially instead, ie doubling or halve it, so my suggestion is when you also hold Alt, so Ctrl-Alt-scroll it will do this.