I'm not trying to convince you one way or another, but I would just like to add this:
If you put a general-purpose utility method in a toolbox, you don't know what people are going to use it for. It could end up being used for a number of non-animation purposes, and nobody will question whether they are getting an even distribution of randomness until somebody else notices it.
<soapbox>If code size is the primary concern, my personal opinion is that the shuffle method should be removed (unless it is required by something else) rather than return mediocre results. </soapbox>