At the game studio where I work we use Unity3D which has no native retargeting (until Mecanim which we cannot currently use).
This meant that (as the artist/animator on our team), everytime I made a change to the proportions of the rig (fairly often due to tight deadlines and iteration) all the animations would have to be loaded, one by one and have their figure files reset. Then they would be exported to fbx (again one at a time). This was a very time consuming process - so I created this script to make it easier.