Looking for a simple graph maker in Unity

For my player controller I have a value which goes from 0 to 1, and determines the speed. To add simple acceleration however, I'd like to be able to make a graph in Unity (preferably with a nice curve) to read out the variable and adjust the speed accordingly.

Pretty much like this: http://i.imgur.com/700jwo1.png

Sadly, there doesn't seem to be a unity function to be able to do this. I've tried using the variable AnimationCurve, but the keys can't be placed by value (only by dragging) and the curves feel a little too harsh for me. Can anybody offer me a solution?