One of the first suggestions made in this thread was to use ockham's Naturalizer script. To that I would add a more generalized suggestion to explore the wide variety of python scripts out there to see what might be useful for you. Ockham and others have created some truly amazing scripts which have saved me hours of tedious work. A few of the key scripts I use very frequently for animation and which might be immediately useful to others include:

Emphasizer -> scale and shift parameter values, and ockham's latest version even adds a randomizer.

Hold Still -> ockham has created two versions: one for legs and one for arms. Plant a figures feet in frame 1, for example, then hit Hold Still Legs and it turns on IK, then deletes the keyframes for the thighs, shins, and feet.

Sparsifier -> another ockham creation (see a pattern here?), this deletes extraneous keyframes to make it easier to manually adjust splines.

So... check out python!