I hear what you are saying about extra water. The reality though is that it's not as easy as you suggest to put an extra station in at last minute notice - it requires another 2-3 marshalls, tables, etc. And you cant just shift the existing 4 stations to fit in an equal distance between either. So you'd end up with 2 stations in close proximity, which means runners would likely bypass one.
Its one hot day in decades, don't think the rule book should be ripped up for it. They were extraordinary circumstances, and probably won't happen again for another 32 years.
Edited: 03/10/2011 at 14:45