Not sure about the feed thing, but found this article when I was searching the web for information on mules, always wanted one myself but really don't know why, I guess it is there individuality..?

http://www.cowboyshowcase.com/mule.htm

will let you know if I find anything else.. They have a live chat here also. You should invite some friends and start a "mule room" if you wanted to go back and forth faster.