I have a Speed6 and the umbilical cord is longer. It allows for the cord to rest on the far right hanger. I am thinking about getting a Speed6 leash for the 3 and trying it out. I will let you all know if it works. - Speed 3 - Speed 6 (image reversed for comparison)
That pic above is perfect. It even seems like there is a magnet in the cap that helps hold it in the door. I have never had a problem hanging my cap like that. Once you know it is there it is actually a great design.