Personally I think that any system based on average results would be pointless. You would get such minor changes in the grading each week that you would be racing the same people week in week out. Even with the old race format, you were only as good as you last performance and this is no different. I'm all for people thinking about different grading systems but it will need to fit in with the race softwares capabilities (which are quite limited is this area). Any system that involves manually working out gradings each week isn't going to happen, or if it does, it won't be me doing it every week. Sorry...
Don't loose sight of the fact that the grading only affects the qualifying grid positions of the first round. Everything that happens after that is down to you
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I have emailed Rob Nelson (BBK) asking what criteria are used to determin the grid positions when 2 people have the same ranking.