If i understand the problem correctly, you are looking for a way to move body parts without affecting the rest of the body.
Choose the character and go to Edit Motion Layer in the Animation tab. There you will see "Full Body" and "Body Part". Just choose the "Body Part" option.
75% of original size (was 667x19) - Click to enlarge
Now you will be able to move the feet without changing the rest of the pose!!
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Phoenix ;)