I have a question about using BoatyBall. When you want a ball in a given mooring field, can you click on the mooring field and have it assign you any available one in that field? Or do you have to select a particular ball in that field? If so, it seems like some of the "luck" in getting a ball or not would simply be whether you went for a ball that others were going for too. Do some people use a strategy of picking a less desirable ball in order to increase their chances? Do the least desirable balls tend to be those closest to shore, furthest, or in between?