'Toning down' an idle animation

Is there any way to ‘tone down’ an (idle) animation without actually editing it in software? The movement is good, but the characters are supposed to be sitting down and they’re moving their torso too much to the sides right now. Some way of setting a constraint to where the bones can move based on the first frame of the animation or something?

A good source for idle animations would also be appreciated, I couldn’t really find anything useful in that huge mocap db or anywhere else.

You could blend between an animation with no movement and all and the idle animation, using a weight of 0.5f or similar. Failing that, you could apply a Vector3 to the bone(s) in question in LateUpdate() to manually set their rotation.