Loop Animation

This Script is intended to loop keyframes, it locates the first and the last animation key of all selected objects, then all keys are copied and moved to the last key location, obviously your first key and last key needs to match for the animation to loop properly,
it works on position rotation and scaling.
the iteration parameter is the number of times you apply the script, it is an exponential factor, let say you have 50 keys, the first iteration would give you 100 frames, the second iteration 200 frames, the third 400 frames, etc...
for installation, drag and drop it, go to customize user interface/toolbar, the category is "SimonScript".