Not even sure this is possible. But say you have an object on a motion path with hundreds of keys (not able to be reproduced by expressions). Would it be possible to put an expression on a slider linked to those keyframes to dynamically control, say, the absolute minimum and maximum values the object travels on the x axis? 

Sort of like scaling the entire motion path of keys in one or all directions, but tying that to a slider, so that when the slider is at 0, there is no motion. ie it clamps all values to 0.

There is probably an easier way to do this but I was wondering if this it was possible like this. Thanks,

-TG

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VFX & Motion Graphic Artist
teddygage dot com