It would be great if, after recording some motion with any of the animation tools, there was a way to 'thin-out' the amount of detail that was captured. Recording motion with a mouse hardly ever results in the perfectly smooth believable motion required. When it's played back you can see it's picked up every nuance of the mouse movement - and that's a problem if you want fluid animation.

It would be cool to have an adjustable 'Animation Detail Threshold' so that we can dictate how much detail is captured in the movements we make with our mouse.

I suppose you could imagine it as a sort of 'Lazy Mouse' for animation, but it's the sort of thing that will make an animation look professional and smooth rather than wobbly and amateurish :)