I was thinking of grabbing the date of the earliest post and then when short stats counts the total posts the number could be divided by the total days that have elapsed since the earliest post. This would give a daily average. One could also divide by 7 days for a weekly average too.
The numbers generated could be stored in short stats' cache field so the queries aren't run with every page load too. I will get this in for IIP 6.0
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