[Feature request] Animation curves smoothing

Hi,

I'd like to propose a new feature - animation curve smoothing. It would be great to have something similar to Blender's "Smooth Keys" option found in the Curve Editor. It is extremely useful while working with motion capture data. I am actually using UMotion to work with data captured in Unity Editor a lot. In such case one needs to export the animation to FBX, import it to a chosen 3D package, smooth the motion and then re-import to UMotion again. It's certainly doable, but animation smoothing in UMotion would be a great addition and a huge time saver. It would be great if one could smooth out selected animation keys both in Dope Sheet and Curves view. The smoothing should be incremental - ideally accessible with a hot key combination.