CJ Cow provides a look at creating multiple duplicates of an animated arm to fake a motion-blur or a create a smear frame effect in Maya that works great for a cartoony character’s animation.

This approach is pretty simple but in many ways rather limited as to what you can do

In answer to a question on the 11 second club, CJ shows how to do this on an existing rig, rather than creating the functionality in a brand new rig. I am sure there are other methods, but this seems like a simple and quick solution for limited shots.